[dylan604]

There were also the audio CDs that had data on them. Audio CD players would just play the audio, but a CD-ROM could access both. Some had apps that were games that would play the audio portion for the game.

If you want to know about the different types of CDs, you'll want to know about the various colors: https://en.wikipedia.org/wiki/Rainbow_Books

[dmicah]

Some Playstation 1 were setup to also play the game soundtrack if you put them in an audio CD player.

[nullindividual]

MechWarrior 2: Mercenaries (for PC) was the same way. Rocking soundtrack. Beautiful game, provided you had a Voodoo 2.

[jwells89]

The Mac version of the original Descent was like this too, with a great redbook audio soundtrack. The game wasn't locked to the original disc though, you could pop out the CD in the middle of the game and replace it with any other audio CD and it'd play that just as well.

[netsharc]

I remember this site from the 00's: http://cdrfaq.org

[tarsinge]

I remember listening to the Warcraft 2 soundtrack from the game CD-ROM in the living room audio CD player.