Question: "If You Ever Leave Me" is a vocal duet between Barbra Streisand and Vince Gill, The song was written by which American adult contemporary and pop/rock singer, songwriter, musician and record producer who has sold over 30 million records?
Sentence (from "Richard Marx"): Richard Noel Marx (born September 16, 1963) is an American adult contemporary and pop/rock singer, songwriter, musician and record producer who has sold over 30 million records.
Relevant evidence: Yes