AB'S (often written "A.B.'s" in the UK) is a male Japanese rock band formed in Tokyo in 1982. In Japan, their music is regularly associated with "city pop" or album-oriented rock. Their song "Deja Vu" was released in the U.K. and often categorized as instrumental and or jazz funk, but the music of AB'S, including "Deja Vu" is also known for their chorus performance in Japan. AB'S is sometimes known for a musical style that combines elements of pop, rock, funk and progressive rock.