Conversation so far:
what is unbreakable?
Unbreakable is a song recorded by Irish boy band Westlife.
how many copies did Unbreakable Irish boy band Westlife sell?
over 200,000 copies
what was turnaround?
the band Westlife fourth studio album

Question: when did Brian leave?
Self-contained rewrite: when did Brian McFadden leave the band westlife?