Jack Kapp was heavily involved in the American recording industry from the '20s through the '40s, missing out on rock & roll but contributing greatly to the pop music that prefaced it. He often worked alongside his brother Dave Kapp as well as sister Bertha Kapp, and seems to be the only Kapp who didn't dabble in songwriting and publishing. In the '20s, working with the Brunswick firm, Jack Kapp took the first in a series of actions that would forever endear him to fans of classic blues and other musically pure styles from the era. Heading up Brunswick's so-called "race line," Vocalion, he released many brilliant performances that in some cases stayed in constant distribution in the ensuing decades.