not to sound emo, but do you.....

Usually something strong and empowering will do the trick for me. Most thrash or death metal works. Or sometimes I'll put on something more up-beat, like Finntroll or Harbinger.
 
son_of_northern_darkness said:
How could I forget Downfall by Children of Bodom. It is such a magnificent composition, always lifts me :)
Even though it hate to say it it is a great song very uplifting.
When ever im depressed I listen to Acoustic music like Jeff buckley.But sometimes I listen anything from KsE to Bathory it depends how certain songs apeal to you.
 
Harmaa's "Saapuminen" (or anything off the Airut:Aamujen cd) seems to do the trick for me because it sounds so incredibly sad and mournful
 
Amorphis - Alone
Sentenced - No More Beating As One
Type O Negative - Christian Woman
Low - Monkey
Pink Floyd - Welcome To The Machine
Metallica - One

(or if you want upbeat, nothing can beat)
Carl Douglas - Kung Fu Fighting