It mentioned how every person (and especially us musically inclined 20 somethings) has a song that always cheers them up or makes them want to sing and dance along, almost every time they heard it.
Mine has been "Sofa Song" by The Kooks (for many years now).
Recently, since seeing Easy A in theaters months ago, my happy song is Pocketful of Sunshine! I just cannot get over that great scene in the movie where she is dancing around her room just singing her heart out! Whenever I feel down after work in the car, I put that on and just at the top of my lungs!
I gotta ... I gotta ... I gotta ... I gotta pocket, gotta a pocketful of sunshine ...
You Don't Know Me - Ben Folds feat. Regina Spektor
I love Regina Spektor!!!