"happy" songs?

I'm putting together a mix of interesting songs either with "happy" in the title, or with lyrics that quite obviously deal with happiness. A list of possibilities so far goes

"Happiness Is a Warm Gun"--Beatles
"Tread Water"--De La Soul
"Sorry Again"--Velocity Girl
"Happy Together"--The Turtles
"It’s Only Life"--The Feelies
"Life and How to Live It"--REM
"Don’t Worry, Be Happy"--Bobby McFarin
"Happy Jack"--The Who
"Glad Girls"--Guided by Voices
"Once in a Lifetime"--Talking Heads
"Shiny Happy People"--REM

I'm doing this for a composition class centered around the Good Life (which explains why some of those other songs are in there). The assignment would be for students to choose three songs and write reviews for each. Titles of other songs you might think would go well on that list would be appreciated. I'd love to get some blues on there, too. Thanks for your help.