quadruple note
US /ˈkwɑː.drə.pəl ˌnoʊt/
UK /ˈkwɑː.drə.pəl ˌnoʊt/
1.
a musical note having the time value of four whole notes, represented by a large oval note head with two vertical lines on either side.
:
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The composer used a quadruple note to indicate a very long duration in the slow movement.
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The ancient manuscript showed several instances of the rare quadruple note.