Most music listeners don’t realize that there really was a “Mr. Tambourine Man” behind Bob Dylan’s famous song. His name was Bruce Langhorne and he was one of the most important session guitarists of the 1960s, particularly in the early years of folk-rock. He was most famous for accompanying Bob Dylan, but he also played on the recordings of Tom Rush, Richard & Mimi Fariña, Richie Havens, Gordon Lightfoot, Eric Andersen, Joan Baez, and Buffy Sainte-Marie. He even wrote scores for some successful motion pictures. Enjoy the music of this under-appreciated folk hero on another edition of “Unsung Heroes, Influential but Overlooked Masters of Modern Music,” on MTPR Monday October 9 at 8 p.m.