There's a really good station in my town now (Brian FM), I try to keep the radio at work tuned into it. Very good variety (Pink Floyd, Metallica, ACDC, Creedence, some of the teenybopper stuff, all sorts), and no advertising other than the station stings. I can put up with the odd tween-bubblegum song if I know that something good like Flock Of Seagulls is probably next.
Unfortunately, the supervisor has funny ideas sometimes about having a variety of radio stations playing.