Jules Cassard was a notable jazz musician and composer, recognized for his contributions to the genre primarily as a tuba player and bassist. He was involved with several prominent jazz groups, including Merritt Brunies & His Friars Inn Orchestra, Ray Miller and His Orchestra, and Wingy Manone & His Orchestra. Cassard's work as a composer is well-documented, with credits on numerous albums spanning from the early 20th century to the early 21st century.

One of Cassard's most enduring contributions to music is as a co-composer of the popular song "Angry," written in 1924 alongside Henry Brunies and Merritt Brunies, with lyrics added by Dudley Mecum in 1925. The song became a standard in the barbershop quartet repertoire and was notably recorded by several artists, including Rosemary Clooney and Perry Como.

Throughout his career, Cassard's compositions were featured on a wide array of albums, showcasing his versatility and influence in the jazz world. His work was included in collections such as "The Rusty Draper Collection: 1939-1962," "The Glenn Miller Formula, Pt. 7," and "Hits Collection 1948-62," among many others. Despite the breadth of his contributions, specific personal details about Cassard's life remain scarce in the available records.