Conversation so far:
What have Fall Out Boy left as a legacy?
Sugar, We're Goin Down as possibly "the most listened-to emo track of all time".
Was this created while they were still together?
In 2009.
Did they have any other hits that did well?
Grand Theft Autumn.
How well did it do?
won the Woodie Award for Streaming.
What happened to them after they went on Hiatus?
CANNOTANSWER.
Was there a particular band they looked up to?
Panic! at the Disco.

Question: What about them inspired the band?
Self-contained rewrite: What about Panic! as the Disco, inspired the band Fall Out Boy?