Wikipedia
AB'S (often written "A.B.'s" in the U.K.) is a male Japanese rock band formed in Tokyo in 1982. In Japan, their music is regularly associated with "city pop" or adult-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.
The band currently consists of Fujimaru Yoshino (guitars, vocals), Makoto Matsushita (guitars, vocals), Naoki Watanabe (bass guitars, vocals), Atsuo Okamoto (drums, vocals). As all the members are session players, sometimes the band is compared to Toto (band) in Japan.
AB'S is sometimes known for a musical style that combines elements of pop, rock, funk and progressive rock.