I am not sure what information is stored inside of durations, but it is
possible that equal? will do the trick (it does a recursive compare).

#(display (equal? (ly:make-duration 1 2 0 0)(ly:make-duration 2 4 0 0)))

return #f

( the duration of an half note vs 2 quarter notes)

[ Same thing for eqv? and eq? ]

Gilles


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