This is REALLY a very subjective call. But that said, here is what "my" ears tell me:
Marantz and Harman Kardon are fairly musical and a tad warmer than the others. Although Denons are pretty musical as well.
Older and cheaper Yamahas aren't the best for music. But the new Aventage series is worth a LOOK!
As for Pioneer. I'd only look at the Elite ICE amp AVRs. They are very clean, detailed and fast.
Onkyo is "great" for HTheater, but not as musical as some above.
If it were me, I'd look at a Marantz (among the AVRs that I've run: Onkyo, Pioneer, and Denon, I prefer the Denon for "music").
It goes without saying that your ears might not agree with mine. So get out and listen to a few AVRs.
Oh, Anthem. First rate but "pricey"!
cnh2