In music, a note head is the elliptical part of a note. Note heads may be coloured completely black or white, indicating the note value (i.e., rhythmic duration). In a whole note, the note head is the only component of the note. Shorter note values attach a stem to the note head, and possibly beams or flags. The longer double whole note can be written with vertical lines surrounding it, two attached note heads, or a rectangular note head.