<play-count-frame> ¶<play-count-frame encodes the CNT & PCNT (play
count) frames. The #:count field is simply a counter recording
the number of times the file has been played See scribbu popm. There may be only one <play-count-frame frame in a
tag. Cf. section 4.17 of the ID3v2 spec.
(define-class <play-count-frame> (<id3v2-frame>) (count #:init-value 0 #:accessor count #:init-keyword #:count))