Nickelback should be erased from history. That's a start.
Rap is to music as an Etch-a-Sketch is to art, so excluding it makes no sense.
Otherwise, I'm with wossname who opined that it's a crime to ban any music. One man's pap is another man's manna. It's not for me to say.
Except for Nickelback. And Coldplay. Definitely Coldplay.
Edited to add: I can't say I'd ban specific blues songs, because I cordially despise the blues as a genre. I can't stand to listen to it. To me it's all the same, and the sameness of it is just BORING. I enjoy playing it, because it lets players stretch their creative muscles, and it's always fun to communicate with other musicians. I can just lock in with the bassist, maintain the groove, and relax. That's fun. When I play with blues enthusiasts, they're always like, "Do you know [insert name of boring song here]?" I'm always all "Nope. Not a clue. What rhythm and what tempo is it?" Usually they can tell me what kind of shuffle, in 3 or 4, and how fast. I make sure they know I'm relying on them to cue me for stops and stuff, I count it off, and we're off. It usually works out.