[4] In 1926, Kapp joined Brunswick Records and was put in charge of their "race" label (Brunswick 7000 and Vocalion Records 1000 series), where he scouted, signed or produced artists including, King Oliver, Jelly Roll Morton, Pinetop Smith, Leroy Carr, Frankie Jaxon, and Cow Cow Davenport, among others.

The artists signed by Kapp included Crosby, Cab Calloway, the Mills Brothers, the Boswell Sisters, and Mildred Bailey.

Kapp also signed new performers such as Chick Webb, Art Tatum, Jimmie Lunceford, Ethel Waters, and a year after the company's founding, Louis Armstrong.

Dave Kapp was instrumental in building the company's extensive hillbilly catalogue, allowing Decca to corner the market on country music for years.

When Brunswick shifted its back catalogue to a 25-cent subsidiary label in an effort to sink the fledgling company, Kapp further reduced the price to 35 cents per disc.