PJ Harvey '50" Queenie' (cause thats how I feel when I am manic)
Amy Winehouse 'Back to Black' (know it's about love but the repetition of Black at the end reminds me of depression)
Smashing Pumpkins 'Soma' (the guitar solo sounds like a car out of control on a mountain road - like me when I am mixed)
Bonnie "Prince" Billy 'I see a darkness' (depression)
Nirvana 'All Apologies' (accepting yourself and saying goodbye)
The Pixies 'Where is my Mind' (yeh, where the **** is it?)

And, as you can tell, I could go on for hours. Music is my obsession.