Conversation so far:
What happened in the group's decline?
Brown's solo aspirations led to the further dissension in the group, who felt they weren't.
When did this begin to occur?
1965.
What was Brown's ascension?
a solo artist.
Did his solo career take off?
reaching the top 10 of the Billboard Hot 100.
What were some singles he made during his solo career?
"Papa's Got a Brand New Bag".

Question: Why did Brown go solo?
Self-contained rewrite: Why did Brown go solo?