Founded in 1947, Hal Leonard LLC has become the worlds largest source of music performance and instructional materials, with a catalog of over a million products in both physical and digital form. They represent many of the greatest songwriters and artists of all time and publish and distribute works from all genres of music for all styles of musicians and ensembles. Founded in 1947, Hal Leonard LLC has become the worlds largest source of music performance and instructional materials, with a catalog of over a million products in both physical and digital form. They represent many of the greatest songwriters and artists of all time and publish and distribute works from all genres of music for all styles of musicians and ensembles.