Diapason
Diapason may refer to:
Diapason (interval), the name of the just octave in Pythagorean tuning
Diapason (pipe organ), a tonal grouping of the flue pipes of a pipe organ
Diapason (magazine), a French classical music magazine
The Diapason (magazine), an American magazine for organ builders and players
Diapason normal, the official French standard of concert pitch
Diapason, a 1978 novel by Thomas Sullivan
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