id say its equal, theres tons of people who see relationships in movies and then feel the need to be in one, or like commercials for taco bell and then they go and get taco bell. but probably a big part of blaming violence on music is because its the tv station reporting it and dont wanna just blame themselves hahaha
but basicly people who have violent tendancies will just gather stuff around them to feed their anger, so if they have thoughts of killing people, they'll start buying horrorcore music and renting violent movies and shit to get them more motivated. like for example one time i had beef with this dude, and i was pissed off at him, and so i listened to 2pacs song hit em up just over and over and over again and in my mind i was thinking "thats what i gotta be like in this situation, i gotta be like pac" and by the end of the week i ran up to the guy and wanted to fight him.
but i think movies and music are both equally influencial, but i think movies and tv are just more subliminal about it, and music is much more direct.