How to deal with someone so controlling? (Please Help...)?

You need to talk to her about it like an adult. Don't get over emotional, or throw a "tantrum" (I hate that word too).

Just sit down and explain to her in a civilised manner that this music won't make you violent, and you enjoy listening to it. Why would she want to take away something you enjoy? Music is about opinion and taste, what someone likes, someone else might not. You should be able to make you own decisions about music, and have some independence. Also there's far worse things than music, Jesus Christ.

Also, I always wear headphones when I listen to music, so my parents have no idea what I am listening to.

And if you have a computer (which I'm assuming you do, considering you posted this question), just download music using bit torrent (trust me, I've used it a **** ton, and Ive never got any viruses from it, but still be careful). Then burn it onto a blank disc. It's much less trouble than it sounds.

Goodluck :)

go to a friend download it to you ipod and listen to it. sit both of your parent down and explain it to her make a bet tell her to give you a month or so to listen to it and if it don't make you violent then you can continue to listen to it, be honest tell her if she wont let you listen to it that you'll find a way to so the best thing for her to do is to know that your listening to it rather than find out and make it worst.