From angel-in-tears. :)

[ladyofleithian]

happy: A Happy Ending by Chris Vrenna (American McGee's Alice soundtrack)
love: Love's a Loaded Gun by Alice Cooper
hate: All These Things I Hate Revolve Around Me by Bullet For My Valentine
light: Lights Out by Breaking Benjamin
dark: The Dark And Endless Dalek Night by Ben Foster and the BBC Orchestra
good: He Was A Good Man by Ben Foster and the BBC Orchestra
bad: Fairy Tale Gone Bad by the CDM Chartbreakers
smile: Sadly, none of these. *Needs more smile-related songs or something* 
cry: I'm So Lonesome I Could Cry by Amy Lee (original by Johnny Cash)
girl: Girl's Not Grey by AFI
boy: If I Were A Boy by Beyonce
sad: Hindi Sad Diamonds from the Moulin Rouge soundtrack
lost: Lost In Paradise by Evanescence
night: This Night by Black Lab
day: The Final Day by Ben Foster and the BBC Orchestra
wolf: - Hungry Like The Wolf by Duran Duran
robot: - Mr. Roboto by The Styx
dance: Safety Dance by Men Without Hats
time: Time from the INCEPTION soundtrack
life: It's My Life by Bon Jovi
death: Dance of Death by Andrew Bird