| http://www.w3.org/ns/prov#value | - lower notes in order to play notes not in the C major scale, (d) to provide strong visual indications of the pitch of the note to be played, (e) to provide additional reinforcing visual indications on whether the note to be played is a C major (natural) or accidental note, (f) to provide a form of music notation that has a direct spatial correspondence to the proportional start times and duration
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