NASHVILLE, Tenn. -- Gordon Stoker, a member of the Jordanaires vocal group that backed Elvis Presley, died Wednesday. He was 88.His son, Alan, told The Associated Press that Stoker died at his home in Brentwood, Tenn., after a lengthy illness. Stoker, who was born in Gleason, Tenn., got his start playing the piano on WSM radio and its signature show, the Grand Ole Opry.Alan Stoker said his father was just 15 when he started playing professionally. He joined the Jordanaires and became tenor vocalist. The group was already well known for their gospel singing when Presley recruited them to perform on Hound Dog, in 1956.The quartet performed on the nationally syndicated show Eddy Arnold Time.They also performed with Patsy Cline on Crazy, with Jim Reeves on Four Walls, on George Jones' 1980 hit He Stopped Loving Her Today, and on Kenny Rogers' Lucille.They were elected to the Country Music Hall of Fame in 2001.