You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "Who has been involved in more music groups, Ryuichi Kawamura or Billy Mackenzie?" whose answer is Ryuichi Kawamura.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Ryuichi Kawamura music groups
Useful Output:

Doc 1: 河村 隆一 (かわむら りゅういち), born on May 20, 1970 in Yamato, Kanagawa Prefecture, Japan, credited in 28 albums.
Doc 2: INORAN · Ryuichi Kawamura (河村隆一) · Tourbillon · FAKE? · STRAY PIG VANGUARD · SHUUBI · HIDEKI (栄喜)
Doc 3: Ryuichi Kawamura · Luna Sea · Cradle · Slaughter.
Doc 4: Japanese singer. Born on May 20, 1970. He debuted as a vocalist for the visual rock band LUNA SEA and started his solo career in 1997.
Doc 5: Currently. Tokyo, Tokyo, Japan ; Member of. Luna Sea, Tourbillon ; Also Known As. 河村隆一, ЯK, Rayla ; Genres. Pop, J-Pop ; Album. Showing 10 of 15 show all.