Haynes nevertheless enjoyed his greatest renown as a sought-after session player -- while he appears on myriad recordings headlined by Skeets McDonald, Hawkshaw Hawkins and Jean Shepard, his most enduring work remains his contributions to Patsy Cline's seminal Decca performances, including Crazy, She's Got You, and San Antonio Rose. The Cline sessions also introduced Haynes to renowned producer Owen Bradley, who became his mentor -- Haynes spent a number of years as Bradley's assistant, and when the producer relocated to the West Coast in 1969 to accept a new job with Kapp Records, he installed Haynes as his replacement at Decca. Haynes spent ten years as a staff producer with the label (later rechristened MCA Nashville), helming more than three dozen sessions for bluegrass giant Bill Monroe. He additionally supervised Jeanne Pruett's 1973 chart-topper Satin Sheets, and earned the Country Music Association's Producer of the Year honors for Cal Smith's 1974 blockbuster, Country Bumpkin. On occasion Haynes even tried his hand at songwriting -- while never a prolific composer, he did co-write Del Reeves' 1965 number one single Girl on the Billboard, a song reportedly inspired by a swimsuit model on a Coca-Cola advertisement and scrawled in the dust covering the dashboard of Haynes' car in the absence of pen and paper. After three years as vice president of MCA Nashville, he retired in 1981, but continued teaching music until just prior to his death in Tyler, TX, on New Year's Day 2009. ~ Jason Ankeny, Rovi