My opinion;

Rap might be hard to listen, but here's my list of artists I simply either cannot stand or would be rather listening to gangsta crap instead:

1. BRUCE SPRINGSTEEN -- all times world champ on stuff you just want to block your ears period

2. Dave Mason

3. Allman Brothers

4. Three Dog Night

5. Grateful Dead

Sky is the limit

@dayglow I listed bands, not genres. I even think they have different genre, but, indeed southern kuntry rock is truly the worst and hardest listening experience.