Who has been involved in more music groups, Ryuichi Kawamura or Billy Mackenzie?
Ryuichi Kawamura:  After the group disbanded in 2000, Kawamura continued his successful solo career. Ryuichi Kawamura:  He has recently rejoined Luna Sea, as they reunited in August 2010. Billy Mackenzie: William MacArthur "Billy" MacKenzie (27 March 1957 – 22 January 1997) was a Scottish singer, with a distinctive high tenor voice; he was best known as a member of The Associates.
i don't know