Positive songs
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Black Eyed Peas - I Have a Feeling
Pharrell - Happy

Upbeat songs that just make you happy
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Daft Punk - <lots of their songs>
Walk the Moon - <lots of their songs>
Gnarls Barkley - <lots of their songs, esp. Smiley Faces>
Pentatonix

Honestly, Christmas songs, too... as lame as that sounds.

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I'm not a fan of pharell, but Happy is a positive song. lol. The music video shows happy people!