I like it when it's just screaming! It's good. Well, it helps me relax (don't ask how something so loud helps, but it does).
I'm in a bad mood if I haven't listened to music that day. It really helps.
I'm a fan of many bands, and if I list them all then you'll be reading for centuries, so I'll give a few from different types of music.
Slayer, Slipknot, Trivium, Blink 182, Green Day (don't like the American Idiot album though), THE OFFSPRING, Metallica and NIRVANA (in my opinion the best band EVER!!!)!