Question: Amber Calling are an Australian pop punk and emo band from Adelaide, which formed in 2005 as 919, during their career they have supported shows by Panic! at the Disco, an American rock band from Las Vegas, Nevada, formed in what year?
Facts:
Amber Calling has supported Panic! at the Disco.
Panic! at the Disco was formed in 2004.
Answer: 2004