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Split sharp

Split sharp is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Split sharp rather than just read about it. In short: A split sharp is a kind of key found in some early keyboard instruments, such as the harpsichord, clavichord, or organ. It is a musical key divided in two, with separately depressible front and back sections, each sounding its own pitch.

Split sharp — main illustration
Split sharp — illustration

Key takeaways

  • Split sharp belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Split sharp to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Split sharp from memory before moving on to harder problems.

Reference excerpt

A split sharp is a kind of key found in some early keyboard instruments, such as the harpsichord, clavichord, or organ. It is a musical key divided in two, with separately depressible front and back sections, each sounding its own pitch. The particular keys that were split were those that play the sharps and flats on the standard musical keyboard (the "black keys" on a modern piano).

Split sharp. A sharp key divided or 'split' into two parts: the front part is about one third the length of the whole. Usually the back part is set slightly higher to facilitate playing. Each part has its own [parts] so that two notes are available. In Italian instruments it was common...to provide split sharps for e♭/d♯ and g♯/a♭. The usual practice was to put on the front part the note that would normally be found there, e.g. e♭ and g♯. Split sharps served two distinct purposes. First, in the broken octave, they allowed an instrument to include deep bass notes while retaining a short, compact keyboard. Second, in older music, tuning was generally not done by equal temperament, which treats note pairs such as A♯ and B♭ as the same pitch. Instead, they were assigned slightly different pitches on enharmonic keyboards (particularly in "meantone temperament"). This allowed certain musical intervals, such as the major third, to sound closer to their ideal just value, hence more closely tuned to just intonation. Split sharps present advantages and disadvantages: "Obviously this would have its advantages under some circumstances in terms of intonation. However, the complexities of fingering and hand position dictated by such a keyboard configuration presented problems." Specifically: "Such devices were obviously an impediment to rapid scale work in the lowest bass register, but this does not matter greatly as Italian seventeenth-century music generally avoids writing of this kind." In modern usage, split sharps are usually the method of choice for custom keyboards that play 19 equal temperament, which, like meantone, uses different pitches for sharps and flats that are enharmonic in the standard 12 tone.

Notes

References

Further reading Kottick, Edward L.; Lucktenberg, George (1997-05-22). Early Keyboard Instruments in European Museums. Indiana University Press. ISBN 978-0-253-33239-4.

Illustrations

Split sharp: The keyboard of a harpsichord by Bernhard von Tucher (Germany). The keyboard has "divided black keys" in order to tune the instrument in two different keys (in meantone temperament).
The keyboard of a harpsichord by Bernhard von Tucher (Germany). The keyboard has "divided black keys" in order to tune the instrument in two different keys (in meantone temperament).
Split sharp: In this harpsichord built by Clavecins Rouaud of Paris, the two lowest sharps are split, following the broken octave scheme.
In this harpsichord built by Clavecins Rouaud of Paris, the two lowest sharps are split, following the broken octave scheme.
Split sharp: Archicembalo keyboard in cents.
Archicembalo keyboard in cents.

Worked examples

Example 1 — a first encounter with Split sharp

Start with the simplest possible case. Write down what Split sharp claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Split sharp before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Split sharp ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Split sharp

In research
Split sharp appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Split sharp in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Split sharp is common in secondary-school and first-year university syllabi. It links to neighbouring topics Musical keyboard layouts, Musical tuning, so understanding it makes those chapters shorter.
In everyday life
Look for Split sharp outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Split sharp in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Split sharp means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Split sharp out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Split sharp in simple terms?

A split sharp is a kind of key found in some early keyboard instruments, such as the harpsichord, clavichord, or organ. It is a musical key divided in two, with separately depressible front and back sections, each sounding its own pitch.

Why does Split sharp matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Split sharp?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Split sharp.

Tags

  • Musical keyboard layouts
  • Musical tuning

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