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 "Barbra Streisand's Greatest Hits Volume 2"): It also features a new version of "You Don't Bring Me Flowers", which was released as the collection's only single on October 7, 1978.
Relevant evidence: No