Assertion: keyboard's design | /r/HasProperty | based on note
Facets:
value: heavily
type: DEGREE
Source sentences:
text: The earliest designs of keyboards were based heavily on the notes used in Gregorian chant (the seven diatonic notes plus B-flat) and as such would often include B♭ and B♮ both as diatonic "white notes," with the B♮ at the leftmost side of the keyboard and the B♭ at the rightmost.