sixty-fourth note
noun/ˌsɪksti ˈfɔːθ nəʊt/
/ˌsɪksti ˈfɔːrθ nəʊt/
(North American English) (British English hemidemisemiquaver)
(music)- a note that lasts half as long as a demisemiquaver
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sixty-fourth note