Bill Keesman is an American songwriter recognized for his contributions to the music industry. He has been credited with writing and arranging music for several notable artists and bands. Among his works, the song "Let's All Sing Together" has been performed by prominent orchestras and bands, including Benny Goodman and His Orchestra, Glenn Miller and His Orchestra, and Harry James. His work spans several decades, with recordings appearing in various formats and compilations from 1940 to 2011. Despite variations in the spelling of his name, including Bill Keesham and Bill Keeshan, his impact as a composer and lyricist is acknowledged in the music community.