OST is not as good as in the past, but I what I find myself listening to is Channel X, The (sorta) classic rock channel, Rebel radio, and the one with Jackie Brown as the DJ, Lowdown I think it's called. Not nearly enough metal here, at all.
I never would have thought that The Germs would be on any OST, so that's cool. Would have also preferred the LIVE version of Whiskey River by Willie Nelson, as it BLOWS away the original recording. Jesco White is THE best DJ by far. I've been a fan of the Dancing Outlaw for years, they should have gotten the rest of his awesome family involved in some way!
I don't see why we can't have Independent Radio and play our own music that we OWN. It's ridiculous that it's not possible! Especially when most other versions of GTA have it.