Glen is one of the leading figures of country-pop having racked up a steady stream of Top Ten singles, highlighted by classics like "By the Time I Get to Phoenix," "I Wanna Live," "Wichita Lineman," "Galveston," "Rhinestone Cowboy," and "Southern Nights." Boasting Glen's 's smooth vocals and layered arrangements, where steel guitars bounced off sweeping strings, those songs not only became country hits, the crossed over to the pop charts as well, which was appropriate, since that is where he began his musical career. Originally, he was a Los Angeles session musician, playing on hits by The Monkees, Elvis Presley, Frank Sinatra and Merie Haggard. By the end of the '60s, he had become a successful solo artist, and that success would not abate until the late '80s, when he stopped having radio hits and began concentrating on live performances at his theatre in Branson.