I have to agree with Kat completely. I think that we can study these "texts" in class because N.W.A has been censored a lot and their song "Express Yourself" is specifically about being censored.
"Some musicians curse at home
But scared to use profanity
When up on the microphone.
Yeah, they want reality.
But you wont hear none.
Or they ban my group from the radio.
Hear nwa and say hell no!."
N.W.A. makes a point to break the limits of censor ship, and this album changed the way that rappers rapped, as this was one of the first to use a lot of profanity and violent language. So you might say that they had quite a few "novel ideas"
As for Bob Dylan, I would say that you can study almost everyone of his songs as a poem or a piece of literature. I don't think his lyrics were as controversial as N.W.A but his style and music were revolutionary. As for loving him or hating him I don't know why people hate him so much. I have heard a lot of different responses but I don't know, I personally like Bob Dylan a lot. He changed the way people thought of Folk and Rock by combining them, and upsetting a lot of people and I think for that he does plays his own game with his own rules.