In what may be one of the weirdest stories ever, a New York band called Liars is friends with a band called Architecture in Helsinki that was at the same hotel as Fall Out Boy, and while snooping around on an iTunes network, they found a bunch of guitar tracks that Joe Trohman had put on iTunes. The band has said before they do a lot of songwriting that way, what with being on two buses... and I guess it's true.