Popular Titles:
* "Rainbow" by Sia
* "Rainbow" by Kesha
* "Rainbow Connection" from The Muppet Movie
* "Over the Rainbow" by Judy Garland (from The Wizard of Oz)
* "Rainbow in the Dark" by Dio
* "The Rainbow" by The Cure
* "Rainbow" by Kacey Musgraves
* "Rainbow" by Rita Ora
Other Titles:
* "Rainbow Veins" by The Strokes
* "Rainbow Man" by Eric Clapton
* "Rainbow" by James Taylor
* "Rainbow" by Elton John
* "Rainbow Warrior" by The Housemartins
* "Rainbow Serpent" by Midnight Oil
* "Rainbow Babies" by The Avett Brothers
* "Rainbow Love" by Johnny Nash
* "Rainbow Ride" by The Flaming Lips
* "Rainbow" by The Beatles (an unreleased song)
* "Rainbow" by John Lennon (an unreleased song)
This is not an exhaustive list, as there are many artists who have used "rainbow" in their song titles. The popularity of the word in music stems from its symbolic association with hope, happiness, and diversity.