Is rock music the devils music?

It depends on the song. If a song promotes hatred, violence, fornication, and anti-religious beliefs, then that song could be called "music of the devil." If it promotes respect, love, peace, faith, equality, and kindness, then it is not. Some people believe that it is otherwise, because it promotes freedom and non-conformist values. I think Metal music is by far more devilish than rock music.

The Bible does mention stringed instruments and cymbals praising the glory of the Lord. You could call that a whole lot of purposeful racket! It is true that a lot of "rock" music in the culture does not glorify God but there is still a lot of rock music which does glorify him.

Why does everyone just assume that rock is the devils music? Maybe some people sing about the devil or whatever but really I see no difference between rock or any other music. If rock influences people, that's their problem because rap does the same exact thing. All rap talks about now or days is drinking and smoking.

However, there also exists Satanist (meaning it worships Satan, the devil) rock, metal and/or screamo. However, it isn't healthy to generalize and say that all rock is so because it really isn't. On the contrary, most of the best rock is Christian.