Museum of Obsolete Media on Twitter: "CD-R Audio discs were introduced in 1997 for use in standalone audio CD recorders that required these special discs since copyright levies were applied to them.
TDK CD-R - Audio Music CD-R = 80 minutes Music Recording: Amazon.de: Computer & Accessories
Q. What's the difference between audio and data CD-Rs?
CD-R CD74R/251 | Philips
Maxell CD-R Audio Music 80 Minutes Available From DataStores | London