[blt]

This was true of a lot of PC games from that time IIRC.

[digi_owl]

Yep. Basically the trick was to make one track as data, and the rest as redbook audio.

I seem to recall running into the odd album that was done up in a similar way to bundle images and such for fans.

Found the Wikipedia article on it btw, Mixed Mode CD: https://en.wikipedia.org/wiki/Mixed_Mode_CD