Listen to the Song Here:
The Sean Garrett produced mid-tempo track, off McCartney's album Departure, chronicles the yearning that lingers after splitting from your first love.
"I've been a fan of Luda's throughout his career, and having him on this track was an amazing honor," McCartney says of the collaboration. "He's innovative across the board and always brings the freshest lyrics to any track."
The busy teen idol will embark on a tour in support of Departure next month. In March he'll appear on an upcoming multi-episode arc on ABC Family's Greek.