The Zondervan Corporation of Grand Rapids, Michigan said, "Elmo Mercer is one of America's favorite gospel songwriters." The "Singing News" calls him "one of the top ten great composers of gospel music and one of the most dominating forces in gospel music today."

Elmo wrote his first song, "A Glimpse of Jesus" at age fourteen, later contracted and published by the John T. Benson Publishing Company of Nashville, Tennessee. To date he has written over 1,600 songs and arranged thousands more for top singers, groups and publishers nationwide. He was church pianist for Park Avenue Baptist Church in Nashville for over 38 years. He is now leading music from the keyboard at Scottsboro Baptist Church in Nashville, Tennessee.