Music CDs are pre-recorded compact discs containing music of one or more artists, generally manufactured in large quantities and marketed for profit by music companies and music performers. Music CDs are thin 3” or 5” discs that hold about 1½ hours of store data in digital form. CDs were developed and introduced as Music CDs as a means of storing audio information for playback in the commercial markets, and only later were adapted for data storage as CD-ROMs.

The CD success has been rather astonishing. Originally designed as Music CDs to replace 12-inch gramophone recordings, Philips and Sony collaborators released recorded Music CDs to the marketplace in the early 1980s. CDs have since evolved to read-write audio and video capacities for applications by computer users everywhere. Annual sales of audio, video, and Music CDs now exceed 30 billion.

Plastic Music CDs are replicated in mass production from glass master discs by the billions and contain music, instructions, movies, data, and other information. Photosensitive and clear coated recordable compact discs (CD-Rs) are permanent records used to save data by PC users, musicians, movie makers, and instructors for replay in audio CD players or computers. Read-Write CDs (CD-RW) utilize a different process and can be re-recorded. CD-RWs can be used by musicians to make their own Music CDs at home.

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