Conversation so far:
Who was the new frontman of Foreigner?
Kelly Hansen
When did Kelly Hansen join Foreigner?
March 2005
Who did Kelly Hansen replace?
Lou Gramm
How many albums did Kelly Hansen release?
2
Did Kelly Hansen leave the band?
No
What did Kelly Hansen do before joining Foreigner?
Kelly Hansen was a former singer Hurricane

Question: How many frontmen did the band go through?
Self-contained rewrite: How many frontmen did Foreigner go through?