Marasy is a Japanese pianist and composer known for his piano arrangements of various songs, including anime and Vocaloid music. One of his notable works is the piano arrangement of "Unknown Mother Goose," a song originally composed by Wowaka for the Vocaloid IA. Marasy's rendition of "Unknown Mother Goose" gained popularity for its intricate piano arrangement and emotional depth. His skillful piano performances have made him a well-respected figure in the music community, particularly among fans of anime and Vocaloid music.