Reddit reviews The Melody Book: 300 Selections from the World of Music for Piano, Guitar, Autoharp, Recorder and Voice (3rd Edition)
We found 1 Reddit comments about The Melody Book: 300 Selections from the World of Music for Piano, Guitar, Autoharp, Recorder and Voice (3rd Edition). Here are the top ones, ranked by their Reddit score.
It sounds like The Melody Book, it's popular around my area, although there's no rainbow on the cover
http://www.amazon.com/The-Melody-Book-Selections-Autoharp/dp/0132819171