A 64th note or hemidemisemiquaver is indicated by the symbol xxx and is equivalent in duration to half a 32nd note or demisemiquaver , a quarter of a 16th note or semiquaver , an eighth of an 8th note or quaver , a sixteenth of a quarter note or crotchet , a thirty - second of a half note or minim , and a sixty - fourth of a whole note or semibreve
