There are at least four bands named Complex: a Japanese rock supergroup, a British psychedelic rock group, a Tanzanian band, and a Finnish punk band. 1)ＣＯＭＰＬＥＸ is a Japanese rock band formed in 1988 with Koji Kikkawa (吉川晃司) as lead singer and his long time friend Tomoyasu Hotei (布袋寅泰) from the legendary rock band BOØWY on guitar.
Making two albums both of which went to number one in the national charts, Complex remained as one of the most popular bands in Japan until their split in 1990.

Read more about Complex on Last.fm.