Ed Sheeran - Bad Habits (lead vocals)
Maroon 5 ft. Christina Aguilera - Moves Like Jagger (backing vocals)
Bee Gees - Tragedy (instrumental and backing vocals)
A Bee Gees mashup that inadvertently became an Ed Sheeran mashup, and not the other way around. I wanted to do something special with one of my favorite disco hits, and once "Bad Habits" got into my head, there was no better match. That moment around 4:09 where Barry Gibb harmonizes with Christina Aguilera was a happy accident that gave me chills the first time I heard it.