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.

Question: What songs did they make?
Self-contained rewrite: What songs did Kanjani Eight make?