Assertion: concertina's key | /r/HasProperty | accidental keys
Facets:
Source sentences:
text: It's arranged sort of like a piano so that the middle keys are the natural keys like the white keys on a piano, and the outer keys are the accidental keys, like the black keys on a piano.
text: It's arranged sort of like a piano so that the middle keys are the natural keys like the white keys on a piano, and the outer keys are the accidental keys, like the black keys on a piano.