My favorite urban myths:
ACDC - Anti-Christ, Devil Concert
KISS, the Beatles, Led Zeppelin, Metallica, Guns 'n Roses, Slipknot, Beastie Boys, Marilyn Manson, Limp Bizkit, NOFX, The Offspring, HIM, ABBA, the Gorillaz, ICP, Snoop Dogg, TuPac were all bad and inspired by Satan himself and some had hidden messages from demons.
Playing tapes in reverse would let you hear messages from demons.
Heavy Metal would have subliminal messages that make you kill your parents
Rap has messages that encourage the gangster life, drugs and "illicit sex relationships"
Brother so-and-so saw demons appear next to me when we played (insert band here, usually Beatles or something 70's)
Brother so-and-so was visited by demons and his stuff went through a wall when he had all those records from (insert band here)
When we threw out music from (insert band here) our life was much better and we had less accidents happen.
(Insert famous classical/jazz music conductor/creator) asked me about the Kingdom Melodies when he heard them while I was playing them at my job
The Kingdom Melodies calm me down
I like the new Kingdom Melodies
Funny enough I have music from all of the above mentioned and actual Wicca music. Nothing ever happened to me and I was never inclined to do bad. If you ever had the opportunity to go to an (acid) house music concert or go into the trance/hardcore scene, you should do so. I did frequently when I was a young witness. Music that is so loud and low in frequency that it appears like it's fairly quiet but you can't hear yourself talk. Nice if you have to go to the meeting the next day, you'll hear droning in your ears all Sunday.