Some conservative Christian religions teach that heavy metal and rock music have close affiliation with devil worship or demonic influence. Is this linking of the devil and demons to certain types of music a modern age practice or is there a long history of some music styles being associated with devil worship (either in practice or in accusation)?
This answer of mine discusses the role of the occult in rock'n'roll in the 1950s and 1960s, and then if you look at my reply to a follow-up question, I talk about the way that conservative preachers interpreted rock'n'roll - hope that helps!
You may be interested in this post I made a while back about the association of fiddle playing and the devil, which implicates things like St. Augustine's views on music, the rise of witch panics and the protestant reformation, and so on.