Conversation so far:
Why did they take a hiatus?
By the time the break began, Stump was the heaviest he had ever been and loathed the band's image.
Did they come back together?
CANNOTANSWER.
What side projects did the do?
During the hiatus, the band members each pursued individual musical interests.
Did they make any solo albums?
Stump was the only member of the quartet to take on a solo project while Fall Out Boy was on hiatus, recording debut album Soul Punk entirely on his own.
Was his album successful?
CANNOTANSWER.

Question: Did they work with any other artists?
Self-contained rewrite: Did Fall Out Boy work with any other artists, aside from Stump?