Chicago released the song "Colour My World" on their second album, Chicago II. They also released it as the B side to "Make Me Smile" in 1970, AND as the B side to "Beginnings" in 1971. What? A B-side twice?? Yep. The song was a major player at proms throughout the 70's and has been covered by dozens of artists. Today it's mostly a forgotten oldie, unless you go to a Chicago concert.
watch here