Yes. I have a disk which has 7 albums burned (from my own vinyl copies) onto it in MP3. I can drive from Luxembourg to Swansea on two disks.

I have experimented with formats, including CD-RW, but my car player will NOT play it if recorded as a data disk, only an audio disk with MP3 (in which format the files are read-only), so I can't easliy change the contents.