Conversation so far:
What two groups combined?
Junior golden age and the newly popular V. West
Why did Junior golden age and V. West combine?
After the debuts of Arashi and Tackey & Tsubasa, the golden era was suddenly coming to an end and so was their popularity.
Was Kanjani Eight popular?
On the contrary, a new Kansai Junior unit named V. West was taking off in popularity, more so than their eastern counterpart FiVe.
What songs did Kanjani Eight make?
Popenkarock
Are there any other interesting aspects about this article?
Kanjani Eight, as a newly formed group, held their first concert in December 2002, titled  Kanjani Eight Xmas Party 2002 .
Where did Kanjani Eight play?
Tokyo

Question: How many people were in the band?
Self-contained rewrite: How many people were in Kanjani Eight?