Is rock music satanic?

My sister has never approved of me listening to rock music and influencing my 12 yr old sister. And lately i have been having nightmares but not the type that i wake up in a panic state. My sister claims that it is associated with the music that "Its the Devils work"! I doubt it and some of the bands include Flyleaf which is known as a Christian Band. Is it that the music is conflicting with me having creepy dreams?