It's this song Spotify randomly recommenced me ages ago and IT'S SO GOOD! It's a collab between Panic! At The Disco and some band called fun. (as in fun. is the band name, period included I guess.) It's so good but I've never seen anyone talk about it!

Go have a listen, it's great! 

AlsogoingtoplugTotalChaosagainbecauseit'sthemostfunI'vehadwithaprojectinalongtimesoyeah.