There are a few kinds of happiness, so here are a few songs:

• “A Little Bit Of Love” by Weezer (General happiness)
• “One Way” by Levellers (Anarchic happiness)
• “Pork and Beans” by Weezer (Self-love)
• “The New Year” by Death Cab for Cutie (Not really sure how to explain)
• Anything by “Weird Al” Yankovic (Comedy)

I don’t tend to listen to much happy music, as it turns out, so I ended up going through my entire library and making a playlist, which you can find here.