The Martin and Morris Music Studio (MMMS) imprint permeated the first fifty years of black gospel music. Jointly owned by singer/impresaria Sallie Martin (1895/6–1988) and composer/arranger/pianist/organist Kenneth Morris (1917–88), the MMMS delivered gospel songs to an eager public and offered ordinary Americans the chance to see their names in print as author or composer on the cover of a gospel octavo, copies of which could then be sold to benefit that same ordinary American. Their influence extended far beyond that service, however. Martin and her Singers performed and popularized music bearing the MMMS imprint in venues ranging from small churches in the Deep South to national conventions in Washington, D.C., and widened circulation of MMMS music via Los Angeles recording studios. The unprecedented accomplishments of the MMMS, active from 1940 to 1993, have not been fully explored. Relying on transcribed interviews of the owners by Bernice Johnson Reagon, James Standifer, and others, accounts in historical newspapers, and company archives, this article addresses that void. The centrality of the MMMS in twentieth-century gospel of all types is clarified through examination of contexts for black-owned music publishing in the last century, the owners’ early business models, and their changing roles in the creation, publication, popularization, and dissemination of gospel music for more than fifty years.