 They recorded under a variety of names, including Big John and the Buzzards, the Crackerjacks, the Lee Brothers, and the Ravenscroft Quartet.They were sometimes credited as the Mellowmen, the Mello Men, or the Mellow Men.They sang backup to some of the best-known artists of the day, including Rosemary Clooney, Bing Crosby, Doris Day, Arlo Guthrie, Frankie Laine, Peggy Lee, Elvis Presley, and Jo Stafford.