Naoyuki Sat? (???? Sat? Naoyuki), more commonly known as ??Master or ??Master (both read as 'Nekomata Master', Nekomata refers to a two-tailed cat demon of Japanese folklore) is a composer for Bemani games. His works have appeared in the Beatmania and Pop'n Music series, although he has worked on other Konami video games. Most of his works are instrumental and new age. He has previously composed music for other non-Bemani games, including the Jikky? Powerful Pro Yaky? series.