What is "A&R"?
A&R is short for "Artists and Repertoire," which is the division or department of a music company or record label that is in charge of scouting new talent and artistic development. The speaker calls the man "Mr. A&R man" because he was the one who discovered her. Ex: My cousin got scouted by an A&R manager recently. I think she's going to become a star. Ex: Simon Cowell is an internationally-renowned A&R man.