SpongeBob SquarePants: The Cosmic Shake

Should unlock through natural progression of the game. However if you want to quickly knock this off there is a button at the musical mermaid checkpoint on pirate goo lagoon that keeps resetting after you use it. It's for the telescope where you can see what colours to use for the music puzzle, next to the mermaid. Just hold B and it should reset after about 3 seconds.