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 六十四分音符用xxx来表示，等于半个三十二分音符，四分之一的十六分音符，八分之一的八分音符，十六分之一的四分音符，三十二分之一的半音，六十四分之一的全音。
