Nel corso della sua carriera ha scritto brani interpretati da artisti come Johnny Cash, Nick Cave, Roy Orbison, Bill Monroe, Johnny Rodriguez, Hank Snow, Ray Charles, Tony Rice, Jerry Lee Lewis, Tammy Wynette, Ray Price, Don Gibson, Brenda Lee, Charlie Rich, Lynn Anderson, David Allan Coe, Joan Baez, Tom Jones, Willie Nelson, Waylon Jennings, John Denver, Kenny Rogers, B.B. King, Linda Ronstadt, Olivia Newton-John e Bill Callahan.
Discografia parziale 1968 - Harlequin Melodies 1969 - Looks Like Rain 1971 - Frisco Mabel Joy 1972 - Sing His Own 1973 - Heaven Help the Child 1973 - Live at Montezuma Hall 1974 - I Came to Hear the Music 1975 - Lovers 1977 - Rusty Tracks 1979 - The Sailor 1981 - After All These Years 1988 - In a New Age 2002 - A Long Road Home
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