Originally, Waltz of the Flowers was Christmas music for The Nutcracker; by Peter Tchaikovsky. The level it is used in is Tutu Tango, located in The Ziggurat. It is used as an Interactive Music in LittleBigPlanet 3.
This is an orchestra preforming it. To skip to the part it is played in LittleBigPlanet, Go to 1:19 (One minute, 19 seconds).