Question: Who has been involved in more music groups, Ryuichi Kawamura or Billy Mackenzie?
Sentence (from "Ryuichi Kawamura"): Ryuichi Kawamura (河村 隆一 , Kawamura Ryūichi , born May 20, 1970 in Yamato, Kanagawa) is a Japanese singer-songwriter, actor and record producer.
Relevant evidence: Yes