Conversation so far:
when did Nick Carter (musician) go out on Nick Carter (musician)'s solor career?
In 2002, when the Backstreet Boys expressed a strong desire to leave their management company, The Firm, Carter chose to remain with them to manage his solo career.
was the band upset by this?
CANNOTANSWER.

Question: what was his first solo song?
Self-contained rewrite: what was Nick Carter (musician)'s first solo song?