J.D. Souther is an American musician and singer-songwriter, known for his role in shaping the sound of Southern California rock in the 1970s. Known for his smooth vocals and introspective lyrics, Souther's style blends rock, country, and pop elements. His most notable works include his collaborations with The Eagles, contributing to hits like "Best of My Love" and "Heartache Tonight". His solo work, such as the top-ten hit "You're Only Lonely", has also left a significant mark on the music industry.