Queen. I can't not sing along to Queen. I've tried, and it's made me feel awful for doing it, like I'm eating live babies, or clubbing kittens to death. Every time a Queen song pops on the radio it rapidly degenerates into a sing-off between my mother and I. The Queen CDs are restricted in this house for special occasions, because otherwise none of us would get a moment's peace. Queen is the band my parents would use to calm me down when I was younger, and it's kinda stuck. It's like paracetomol, coffee, and all sorts of illegal substances all packaged into my ears. It never fails to make me feel good. I really, really like Queen. xD
On the complete opposite end of the spectrum...Chimaira works wonders too. Nothing like blasting your eardrums cleans with heavy metal when you don't want to think about anything for a little. Other bands have this effect on me - Rammstein, Deathstars, Murderdolls, etc - but none quite so well as Chimaira. Listening to something extremely violent and depressing that is often barely discernible is also a good way to cheer up when you don't particularly WANT to cheer up.
Also, pretty much the entirety of Suite Precure's OST has this effect on me. Not quite as powerfully as Queen, but if I want to think straight and not burst into spontaneous song like some kind of mutant Disney Princess and keep my eardrums intact, I'll use this. xD
