FILE - Inductee JD Souther and Alison Krauss attend the Songwriters Hall of Fame 44th annual induction and awards gala on Thursday, June 13, 2013 in New York. (Photo by Charles Sykes/Invision/AP, File)LOS ANGELES (AP) — John David “JD” Souther has died. He was a prolific songwriter and musician whose collaborations with the Eagles and Linda Ronstadt helped shape the country-rock sound that took root in Southern California in the 1970s. Souther joined in on some of the Eagles’ biggest hits, such as “Best of My Love,” “New Kid in Town,” and “Heartache Tonight.” The Songwriters Hall of Fame inductee also collaborated with James Taylor, Bob Seger, Bonnie Raitt and many more. His biggest hit as a solo artist was “You’re Only Lonely.” He was about to tour with Karla Bonoff. Souther died Tuesday at his home in New Mexico, at 78.