[Skulhedface]

Happy: Incubus, Morning View(at least it sounded like it had a happy tone to me)

Sad: beh... anything by Silverchair after 1999

Wrist-Slashingly Depressing: Anything by Type O Negative (preferably World Coming Down)

Hope this helps, somewhat. I could list CDs that fit better but I'm more into local or underground bands and those are understandably hard to find if you don't live in this state.