for feelin' happy, try the Tossers ("Madrin Rua'"), some ska ("Funky Kingston" by Toots and the Maytals), good old reggae ("Stick a bush" by the Isrealites), and some happy punk drinkin' song ("Dawn patrol" by the Business).
I have found that Early Alanis Morisette songs, the first three albums are good when your just getting depressed, they set the mood. However, if you are tired of being depressed later Alanis Morisette songs.