korell: See, this is what I'm trying to myself. Get some old games I have running without me needing to use my old CDs, and without losing the music. I don't really want to have to create a disc image and have a virtual CD playing, nor do I want to have a music player running in the background. Some games you can just put music files within the game folders and they'll play, others aren't so nice.
Just some advice when creating backups of your CDs:
(in case you didn't know, if you do then please ignore the text below :D)
In order to properly preserve CD audio in your games, make sure to create either a CloneCD file (.ccd format) or a BIN and CUE pair. Most good imaging programs will create the BIN file and CUE file, which is where the CD audio info is kept.
The ISO format doesn't preserve CD audio information, at least that's the conclusion I have come to according to my own personal research.