In-game music is somehow disabled and yes, I have checked all of my settings. I do not hear any music while driving in GTR Evo and Race 07 - this happened right after it was patched via Steam about a month or so ago. I hear music in the menus, but not while driving.
For that matter, when I was able to hear music while driving (prior to this patch), I've been been able to find a way to skip to a different track.