Assertion: compressed audio optical disc | /r/MadeOf | digital audio
Facets:
value: in the mp3 file format
type: OTHER
Source sentences:
text: A compressed audio optical disc, MP3 CD, or MP3 CD-ROM or MP3 DVD is an optical disc (usually a CD-R, CD-RW, DVD-R or DVD-RW) that contains digital audio in the MP3 file format.