Mother Mother - 'Arms Tonite'
Rise Against - 'Ready to Fall'-- Not really a cheerful song, especially with its video, but I love it all the same. One of the few bands from my adolescence that I still love.
The Cure - 'Friday I'm in Love'-- shut up I like it okay
Kana Hanazawa - 'Renai Circulation'
Yuu Sakai - 'Manazashi Daydream'

Oh, and the songs from There she is!!. Click the leftmost image in my signature and watch them all if you haven't seen them before.