Songs About Rainbows
The Rainbow Connection by Kermit The Frog, but I find Sarah McLachlan's version more relaxing ;)The Neverending Story Theme by Limahl
Somewhere Over The Rainbow by Judy Garland (I like Eva Cassidy's remix)
Rainbow by Mariah Carey
Light A Rainbow by Tukan
Color Everywhere by Deana Carter
Testify To Love by Avalon (Wynonna has also recorded it)
Seven Wonders by Fleetwood Mac
Rainbows In The Night by David Meece
Rainbow In The Sky by Starsplash
Rainbow To The Stars by Dune
Like A Rainbow by After Eternity
When The Rainbow Comes by Shawn Colvin
Follow My Rainbow by Sheena Easton from the Fern Gully soundtrack
And of course, the entire Rainbow Brite soundtrack. ;)
I'm aware of many more Rainbow songs, but these are the ones I like best.
Other songs about colors
Colors of Love from the Sailor Moon SoundtrackColor My World by Petula Clark (I love the remix by Christian group Sierra)
Colors of the Wind from the Pocahontas soundtrack