I was having a hard time associating "The Calendar" with the circumstances of Panic! at the Disco's breakup (because it's been said that it's about the band breaking up), but I read yesterday that Pete Wentz (of Fall Out Boy) wrote it. It makes WAY more sense in the context of Fall Out Boy's breakup than in the context of Panic!'s, so I'm thinking that maybe that Fall Out Boy is the band.