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Most modern pianos have a row of 88 black and white keys, 52 white keys for the notes of the C major scale (C, D, E, F, G, A and B) and 36 shorter black keys, which are raised above the white keys, and set further back on the keyboard.
The piano got its start as a modification of the harpsichord, which had 60 keys. The first pianos, therefore, usually had 60 keys. 60 keys represented five octaves, since there are 12 notes in an octave. As more and more pianos were made, composers began to write more music for the piano. It wasn't long before their compositions took them beyond the five octaves available on pianos at that time.