The Four Freshmen, a jazz vocal group.
Flanigan, who was born in Greencastle, Indiana, was a respected trombonist, and also played bass guitar with the outfit for several decades, beginning on September 20, 1948, and sang the top part.
After retiring from performing in 1992, Flanigan maintained the band's name and was responsible for the group's changing cast of performers.
Flanigan died of congestive heart failure at his home in Las Vegas, Nevada, on May 15, 2011. He was 84.