| http://www.w3.org/ns/prov#value | - In some instances, particularly on organs, some of the black keys would be split so that the performer could choose between, say, D# and Eb so that more keys are usable.Although the keyboard has been equal-tempered since the end of the 18th century, keyboard performers do recognize the difference in tonal relationships between one note and a sharp or that same note and the flat represented by the
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