But why is the layout of the piano keys the way it is?
One of the questions I often get as a piano teacher is why
the keys on the piano are arranged the way they are.
throughout time the piano keys have gone through many transformations and
there have been many variations in the piano keyboard layout.
All the way from the ancient
to the modern piano of today, the piano keyboard and design has changed
after the scales used, what materials were available, tuning of the
time, as well as different ideas on how to best play those notes.
Layout Piano Keys on an 18th Century Fortepiano.
The pattern of the black and white keys has also changed. At times the layout of the piano keys was inverted, instead of the five black keys, they where white and the other way around.
The white keys were traditionally made from Ivory (Yes- elephant tusks :( ) and Ebenholz or Ebony, a very strong black wood.
Today the piano keys on a piano are made from synthetic man-made materials and wood.
scale on the white keys, from C to C, is the diatonic 7 note scale,
also called C-major scale or Ionian mode, and from A to A, there is an
a-minor scale (natural minor) or Aeolian mode.
You can from each white key ascending (going up), play one of the 7
with only white keys.
And using the chromatic changes with the black
keys, you can change each scale (as well as create others) and also
transpose (move) the scale patterns to start from any note.
Pretty clever, huh?
there are two important compromises; one is you can not play intervals
smaller than a half step, and the other is that the modern piano is
tuned in a well tempered tuning- resulting in that the notes in between
them are all a tiny bit false.
This small falseness is hardly
noticeable for a modern ear, but makes it possible to smoothly play in
many tonalities. (This is why J.S Bach wrote the Well-Tempered Clavier
by the way!)
The number of keys is different from instrument to instrument. Most
pianos since 1870 have 88 keys, but there are older grand pianos with
even a few more, some pianos with less, and of course various electronic
keyboards with much fewer keys.
The size of the keys themselves
has also varied. So basically the piano and the layout piano keys has
gone through enormous changes, and still continues to evolve.