Harpsichord Stops: Hear What 8′ and 4′ Change

Press middle C with one 8′ choir engaged, then let your teacher select the 4′ choir instead. Your finger returns to the same key, but the sounding note rises an octave. Select both and that single key supplies two pitches together. That is the first useful distinction: a stop selects a resource; it does not tell your hand to press harder.

This lesson turns those three possibilities into a registration plan for an original eight-bar study. You need a teacher who knows the instrument, a pencil, and a clear distinction between the keys you play and the pitches they produce. You can work out every pitch on paper before approaching the controls.

Inspect the actual labels with your teacher

A choir is a set of strings available across the keyboard’s range. A registration is your selection of sounding resources. A manual is a keyboard; two manuals do not automatically mean two different octave levels. Begin by writing the instrument’s available choirs and which manual plays each one. Leave an unfamiliar label as a question until your teacher identifies it.

Our diagrams use a hypothetical instrument with one independently selectable 8′ choir and one 4′ choir. ON and OFF describe logical states, not directions to push a lever. Carey Beebe’s guide to a first encounter with a harpsichord shows different control arrangements. Have the teacher demonstrate yours, including how to recognize its present setting.

Two logical routes from one key, not a drawing of a harpsichord action. With 8′ alone, C4 sounds; with 4′ alone, C5 sounds; with both, C4 and C5 sound together. With neither choir engaged, this hypothetical two-choir instrument has no selected string choir to pluck. The ON labels deliberately give no physical direction, distance, or location for a control.

If you come from piano, compare How the Piano Works. Its key–hammer–string diagram explains why faster piano-key movement changes the strike. Yamaha’s instrument guide contrasts that hammer with the harpsichord’s plectrum, carried on a jack, which plucks a string. Do not translate a piano crescendo into progressively harder harpsichord playing.

Pressing a key lifts the jacks associated with it. Each jack carries a small plectrum that can pluck a string; Beebe’s jack and plectrum guide shows the component in detail. On a typical register mechanism, moving the register shifts a row of jacks so their plectra either engage the strings or pass clear of them. Your finger can therefore play the same key while a different set of strings sounds. Beebe’s action explanation shows that engagement; ask your teacher to demonstrate the actual controls.

Make an inventory in three short lines: “Manual used,” “Choirs available from it,” and “Starting selection.” Ask the teacher to verify all three. If two controls have similar labels, give the choirs temporary names such as A and B in your notes. Those names keep your plan readable without pretending that the builder labeled them that way.

Test the inventory with a single comfortable key chosen by the teacher. Say the intended selection, let the teacher set it, then play and compare the result with your prediction. If they disagree, check the selected manual and resources before changing your answer. A correct paper rule applied to the wrong keyboard connection can still predict the wrong sound.

Keep today’s first task narrow: identify the selected strings and predict their registers. Questions about how to shape a phrase belong beside that task, but they cannot be answered by assigning 8′ the meaning “soft” and 4′ the meaning “loud.” Those labels describe pitch relationships.

8′ gives the normal register

Here C4 means middle C, and C5 means the next C above it. With 8′ alone, playing C4 produces C4; playing D4 produces D4. “Normal register” means this direct relationship between key and sounding pitch. It does not prescribe a tuning standard in hertz. Use the instrument’s actual tuning when listening with your teacher.

Play the original cell C4–D4–E4–G4 as four quarter notes. First say the key names, then say the sounding names. With 8′ they match. Keep that short cell unchanged for the next comparison so that a different melody cannot distract you from the change of register.

8′ alone: keys and sounding pitches are both C4–D4–E4–G4, in four quarter notes. Read the rows as a comparison, not as two parts to play together.

Read 8′ as “eight foot” and 4′ as “four foot.” These register names come from organ terminology: a shorter pipe produces a higher pitch, and halving its length raises the pitch an octave under comparable conditions. On a harpsichord, the numbers identify pitch levels; they do not mean that every string in the choir measures eight or four feet. The Berlin Musical Instrument Museum’s harpsichord guide, page 3 and Koster’s opening construction discussion explain the organ-derived names and pitch levels.

Write three fields: keys, selected choirs, and sounding pitches. For example: keys C4–D4–E4–G4; 8′ selected; sound C4–D4–E4–G4. If octave numbers are new, write “middle C” beside C4 and “the C above” beside C5.

4′ sounds one octave higher

With 4′ alone, those same keys produce C5–D5–E5–G5. Move each sounding pitch up twelve semitones, retaining its letter name. Your hand stays where it was. Beebe explicitly identifies the 4′ as the octave choir; it is not a request to move your fingers an octave upward as well.

4′ alone: the same C4–D4–E4–G4 keys sound C5–D5–E5–G5. Only the sounding register changes.

The 4 in 4′ does not mean “move four scale steps.” Keep the letter name and accidental and raise the octave number by one: F♯4 becomes F♯5.

A second error is to transpose the key line while also selecting 4′. If you move the C4 key to C5, the octave choir supplies C6. That may be a deliberate choice in another task, but it no longer compares the same keys. Keep one variable fixed during this lesson: change the selected choir while retaining the original finger destinations.

This differs from an instruction in the score to play higher. Octave Signs: 8va & 8vb compares ledger-line notation with an 8va version that sounds the same. That sheet changes how you read a passage. A 4′ choir changes what the instrument supplies for the keys you actually play. Establish those keys before applying the stop map.

Keep accidentals when you change registers. Keys F♯4–B♭4–C5–F♯4 sound F♯5–B♭5–C6–F♯5 with 4′. Both the sharp and the flat stay attached to their letter names; only the octave number rises. The four quarter-note attacks stay in the same places.

Accidentals travel with the note: F♯4–B♭4–C5–F♯4 keys become F♯5–B♭5–C6–F♯5 with 4′ alone. Spelling and rhythm stay unchanged.

8′ + 4′ doubles at the octave

Now select both choirs in your paper model. Each key supplies its normal pitch and the octave above: C4 gives C4 plus C5. This is octave doubling, not a choice between the two pitches. The resulting pairs follow the same rhythm because each pair belongs to one key event.

8′ + 4′: each key supplies its normal pitch and the octave above, together. Play the single-note key line, not the octave dyads.

Apply the rule to every note of a chord too. Keys C4–E4–G4 together produce C5–E5–G5 with 4′ alone, or both of those triads with 8′ + 4′.

One C-major key chord, three views: keys, 4′ sound, and 8′ + 4′ sound. Each sounding chord lasts four beats; the six-note result comes from three keys.

Use Harpsichord Stops: Predict the Sound to put the three versions side by side. Cover its mini-key while naming the sounding notes. Explain each answer from the selected choirs before checking it.

The pitch prediction in three cases. 8′ retains the key’s octave, 4′ supplies the octave above, and selecting both supplies both pitches. “Same note name” refers to the letter and accidental, with the octave number changed for 4′. This summary assumes the hypothetical independent choirs used in the lesson; it does not identify a real instrument’s control layout or manual assignments.

Try one final prediction: keys F4–A4–G4–C4 with both choirs. Name both pitches for every event before looking at the answer row. If you give F5–A5–G5–C5 only, you have described 4′ alone and forgotten the selected unison choir.

Keys F4–A4–G4–C4 with 8′ + 4′ supply the octave pairs below. Returning to middle C does not cancel the octave choir, which remains selected throughout the cell.

Rests remain rests under every registration. In the next cell, only beats 1 and 3 contain notes. A 4′ selection raises those notes but inserts nothing on beats 2 and 4. Say the rests aloud while making your prediction so that your attention stays on timing as well as octave numbers.

C4, rest, E4, rest becomes C5, rest, E5, rest with 4′. Notes change octave; quarter rests retain their timing.

Two 8′ choirs stay at the same pitch level

The notation 2 × 8′ describes two unison choirs, not a sixteen-foot result and not an octave doubling. If both play from your chosen manual, key C4 activates two strings tuned to the C4 register. Keep the two choir identities in your plan even though their note names match.

Two 8′ choirs supply the same C4–D4–E4–G4 pitches from separate string sets. Two sources remain at one pitch level.

The Metropolitan Museum’s Louis Bellot harpsichord provides a concrete example with two unison sets and one octave set. Its description also assigns them to particular keyboards. That assignment belongs to that instrument; copy the resources of the harpsichord in front of you before borrowing any registration.

For key C4, the two 8′ blocks both name C4, while the 4′ block names C5. This separates the number of choirs from the number of pitch levels: two unisons are two sources at one level; 8′ plus 4′ supplies two levels. The blocks are bookkeeping categories, not a drawing of string placement, plucking points, keyboard connections, or the size of a real harpsichord.

Here is a useful counting check. With one 8′, a single key has one selected choir at one pitch level. With two 8′ choirs, it has two selected choirs at one pitch level. With 8′ plus 4′, it has two selected choirs at two pitch levels. Count sources and pitch levels separately before describing what the combination sounds like.

Timbre means tone color: two sounds can have the same pitch but a different character. Plucking nearer a string’s end tends to produce a brighter or more nasal sound; plucking farther toward its middle tends to sound rounder. Two 8′ choirs can therefore offer different colors without changing octave. The exact contrast depends on the instrument. Koster’s construction discussion explains that relationship.

Listen to one 8′ choir, then the other, with your teacher controlling the change. Write a description such as “more rounded here” only after hearing that particular instrument. Do not turn two choirs into a numerical loudness rule. Their combination changes the available sound, but “twice as loud” is not a reliable instruction.

Buff stops and couplers need an instrument-specific check

A buff can mute a choir by bringing pads against its strings. A coupler can connect resources associated with different manuals. Neither word by itself tells you which choir is affected or how to operate the control. The Bellot description identifies buffing of its lower-manual unison strings; another instrument may assign the function differently.

On the Met’s Bellot, the upper keyboard plays one 8′ choir; the lower plays the other 8′ and the 4′. Coupling allows all three to be played from the lower keyboard. Middle C can then activate two C4 strings and one C5 string when those resources are selected. The coupler changes which resources a keyboard can reach; it does not itself mean “up an octave.” Other instruments have different connections. The Met’s object description supplies this example; your teacher identifies the arrangement you will use.

The Horniman Museum’s harpsichord record lists a lute stop and a buff stop separately. That is a useful reason to avoid treating unfamiliar names as automatic synonyms. Ask your teacher to identify each function, then record the answer in ordinary language beside the label.

Before changing a control, identify its resource, its manual connection, and its demonstrated ON/OFF states. The questions work for an unfamiliar stop without assuming that pulling means ON or that the rightmost lever controls the octave choir. For a coupler, describe which connection changes; for a buff, name the choir affected. Your teacher supplies the answers for the actual instrument.

For a buff demonstration, keep the choir selection and key cell fixed while the teacher changes only the buff state. Describe the difference you actually hear in that comparison. For a coupler demonstration, ask which resources become playable from the chosen manual. Record that connection before trying to predict a whole passage with it.

The Cambridge Companion’s construction chapter documents varied dispositions. You do not need a historical survey to begin: write “not available” for a resource your instrument lacks. A complete plan for one instrument is more useful than a long list of stops it cannot play.

Plan a contrast at the rest

Our original study has eight bars in 4/4. Bars 1–4 form the opening, bar 5 is a full-bar rest, and bars 6–8 supply a reply. Learn the key line first with 8′ alone. Bar 4 has two half notes on C4; do not shorten it to make extra time for the change.

Complete original study, keys to play: start with 8′ alone at quarter note = 72. During the full-bar rest in bar 5, the teacher adds 4′; bars 6–8 use 8′ + 4′. Bar 4 retains both C4 half notes.

Before adding the change, count all eight bars while pointing to the key line. Say “rest, two, three, four” in bar 5 and find the G4 that starts bar 6. Practice beginning at bar 6 by itself as well. That restart point needs to be secure before you divide attention between counting and a registration demonstration.

Write one model plan: “Start 8′ alone; during bar 5, teacher adds 4′; restart bar 6 with 8′ + 4′ for octave reinforcement.” Count through the rest while the teacher makes the change. At quarter note = 72, its four beats occupy about 3.33 seconds. That calculation describes the score, not how quickly anyone should operate a mechanism.

The model change belongs inside bar 5, after bar 4 has finished and before bar 6 begins. Four beats at quarter note = 72 last 4 × 60/72 seconds, approximately 3.33 seconds. The rest provides a planned silent window; it is not evidence that a particular control can be reached and changed within that time. Rehearse the operation with the teacher before attempting the complete study.

If the operation cannot fit comfortably, stop the exercise and choose a simpler plan with your teacher. You can also compare complete takes using one registration throughout each take. The learning target is a clear prediction and an executable choice, not the fastest possible switch.

These are the keys for bars 5–8 of the complete study. Count the full-bar rest before restarting on G4; the final whole-note C4 supplies C4/C5 under the model registration.

Predict the first reply bar before playing it. With 4′ alone it sounds G5–F5–E5–D5. With 8′ + 4′ it supplies G4/G5, F4/F5, E4/E5, D4/D5. These create different contrasts: a reply wholly in the upper register, or a reply retaining its lower line with octave reinforcement.

Two sounding replies for the same G4–F4–E4–D4 keys: 4′ alone above; 8′ + 4′ below. The second keeps the normal-register pitches alongside their upper octaves.

For a reply entirely in the higher register, replace 8′ with 4′ during bar 5: bar 6 then sounds G5–F5–E5–D5 without the lower line. To retain the original register and add an upper octave, leave 8′ selected and add 4′, as in our model. Write which of those two contrasts you intend, then compare complete takes on the actual instrument. Neither choice is prescribed by the note pitches alone.

On the stop-octave worksheet, fill the plan boxes with available stops, a precise change point, and your intended contrast. A different plan can succeed. Check it against those three criteria rather than treating the printed model as the only musical answer.

The worksheet has its own original phrase, with the silent change bar at bar 4 and the new selection beginning at bar 5. Our article study places its rest at bar 5 instead. Copy the bar number from the music you are actually using; do not transfer a change instruction merely because both examples have eight bars. On the sheet, the starting box covers bars 1–3.

Its three sounding versions use the same C4–D4–E4–G4 cell as our opening comparison. The mini-key lists each version’s pitches, and the open plan has one model rather than a unique answer. Cover that key for the pitch task, then use the printed criteria for your plan. The sheet’s piano synthesis checks pitch and rhythm; ask your teacher to demonstrate the real registration contrast separately.

Three criteria for an open registration task: use resources the instrument actually offers, specify a clear change point, and state the intended contrast. “Brighter reply through octave reinforcement” is a purpose you can discuss after playing; “more stops” alone leaves that purpose unstated. A valid alternative need not match the model, but another player should be able to understand and rehearse its instructions.

Check the instrument, then separate pitch from timbre

A neutral synthesized pitch model can check that octave relationship. It cannot establish the authentic tone of an 8′ choir, the effect of a buff, or the feel of a coupler. Those require the real instrument and a demonstration. Record separately what you predicted on paper and what you noticed while listening.

The Periods of Music History places the harpsichord among Baroque keyboard instruments and contrasts plucked strings with later piano hammers. Use it for context, then return to your actual stop list. A period label does not specify the registration for this instrument or this phrase.

Keep a short record of the comparison: the selected manual, the starting registration, the changed registration, and one observation. Put an uncertain observation in question form, such as “Can we compare the two 8′ choirs again?” That gives the next session a specific listening task without turning a first impression into a general rule about all harpsichords.

When you revisit the study, predict the reply before you play the opening. If you can name both G pitches immediately and locate the silent bar, the plan is becoming usable. If you hesitate, return to the two-column key-and-sound map for one event. One checked event is a better starting point than repeating eight bars while still unsure which choir is selected.

Explain your plan before playing: name the keys, the selected choirs, the sounding octaves, and the change bar. A Tissimo piano teacher can help check your reading and prepare questions for a supervised harpsichord session. At the instrument, confirm the starting registration and compare the result with your prediction.

Free worksheets for this lesson

• Harpsichord Stops: Predict the Sound — compare the three pitch maps and complete a registration plan.
• Octave Signs: 8va & 8vb — distinguish a written octave instruction from a stop’s sounding register.
• How the Piano Works — review the piano’s hammer mechanism before comparing it with plucking.
• The Periods of Music History — place the harpsichord in a broader keyboard-history timeline.

Sources

• First encounter with the historic harpsichord — Carey Beebe Harpsichords
• The action in the instrument — Carey Beebe Harpsichords
• How the harpsichord works — Carey Beebe Harpsichords
• The harpsichord: national differences — Berlin Musical Instrument Museum
• Louis Bellot harpsichord — Metropolitan Museum of Art
• Harpsichord, 1972.211.1 — Horniman Museum and Gardens
• History and Construction of the Harpsichord — Cambridge University Press
• The Story of the Piano’s Invention — Yamaha