Some of the most famous songs sung by musical geniuses are by composers such as Mozart, Bach, Beethoven, and several others. Santa - Santa is a pre-named fish that is obtained by purchasing a regular guppy for 25 shells and naming it Santa. Santa sings Christmas songs instead of classical music. Ludwig - Ludwig is a blue and black carnivore with sea green fins that specializes in singing songs by Ludwig van Beethoven. Kilgore - A violet ultravore that intimidates other fish by playing the music of Richard Wagner. The only song it knows is Ride of the Valkyries.