As a kid or an old fart, I always found Roger Miller's "Walkin' In The Sunshine" to be a great song for lifting spirits. I get to retire in 4 more years and I'm certainly looking forward to walking in the sunshine when I do.
WALKIN' IN THE SUNSHINE
by Roger Miller
Walking In The Sunshine, sing a little sunshine song,
Put a smile upon your face as if there's nothing wrong.
Think about a good time had a long time ago,
Think about forgetting about your worries and your woes,
Walking In The Sunshine, sing a little sunshine song.
La la la la la dee oh, Whether the weather be rain or snow,
Pretending can make it real,
A snowy pasture, a green and grassy field.