3 pages | PDF | 721.7 KBA Marshmallow World is an upbeat jazz song composed by Peter de Rose and written by Carl Sigman. The song is set in a major key of C and a minor key of A. It has a total of 36 measures. The lyrics talk about the comical image of a world made entirely of marshmallows, and it features a catchy and lighthearted melody. The song is a great choice for anyone looking for a cheerful, toe-tapping tune.