Brother Jack McDuff was a renowned American jazz organist and bandleader prominent in the 1960s and 70s, known for his soulful bluesy sound. His style, characterized by the use of a Hammond B-3 organ, significantly contributed to the popularization of the instrument in jazz and R&B music. McDuff's most influential work, "Brother Jack Meets the Boss," recorded with saxophonist Gene Ammons, served as a major milestone in the soul-jazz genre. His band also launched the careers of notable musicians such as George Benson and Joe Dukes.