Beginning in the late 1920s, there was a subtle shift in the jazz repertoire as combos and big bands began to perform and record songs from the Broadway stage and Hollywood musical. To be sure, tunes based on the blues, older jazz forms (ragtime, quadrilles, etc.), and original compositions continued to be an important part of the jazz “book.” Still, the Great American Songbook grew in ever-increasing importance where the jazz repertoire was concerned.