Musicians who play happy music:

David Bowie

Bowie has endured as one of my favorite artists since I was 13. I remember coming home after a bad day at school and listening to "Suffragette City" and waiting for that cathartic line: "Wham, bam, thank you mam!"
Suffragette City

The Flaming Lips

The Flaming Lips' 2002 concept album, "Yoshimi Battles the Pink Robots", is as fun as the title suggests. A Japanese super-heroine battles robots threatening the human race. The track "Do You Realize?" is undeniably one of the most simple, poignant and uplifting songs the band has ever recorded.
Do You Realize?

Donovan

I can't think of an occasion when Donovan has ever bummed me out.
Colours

Weezer

Although their second release, "Pinkerton," (my favorite Weezer album) is doom and gloom, their debut album is still buoyant and fun. Their 1994 single"Buddy Holly" has the cutest video of all time.
Buddy Holly

Fleet Foxes

I saw Fleet Foxes play in Big Sur three years ago, before they "broke out". Now I consider it tradition to listen to their albums in the car whenever I'm on my way down to Big Sur. I know the video is kind of sad, but I think it still manages to be an uplifting tune.
White Winter Hymnal