<text-frame> ¶A great many ID3v2 frames represent textual information (title, artist
&c) and are represented in a uniform way, distinguished only by frame
identifer. scribbu represents such frames as instances of
<id3v2-frame>:
(define-class <text-frame> (<id3v2-frame>) (text #:init-value "" #:accessor text #:init-keyword #:text))