Split sharp
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.First, in the broken octave, they allowed an instrument to include deep bass notes while retaining a short, compact keyboard.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."[2] 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.
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