For many years Killen was the head of Tree International, Nashville's leading music publisher, writer and producer. Killen once played bass in Hank Williams' band for ten dollars a night; in 1989 he sold Tree to Sony for 50 million. He's worked with just about every star in the Country firmament: Elvis Presley, Dolly Parton, Willie Nelson; and many classics in the Country cannon: "King of the Road", "Okie from Muskogee" and the immortal "D-I-V-O-R-C-E". Killen's new autobiography is "By the Seat of My Pants."