His sound is unmistakable—once you hear the ethereal organ, atmospheric vocals and smooth-as-silk wind chords (“Oblighetto”), it can't be anybody's band but organist “Brother” Jack McDuff's. Not-quite-funk and not-quite-jazz, his tunes lived in a world of their own. Coming up in the hard-bop, experimental ‘60s with huge-sounding, forward-thinking tunes like “The Honeydripper” and moving into the funky ‘70s, doing soulful collaborations with musicians like George Benson (“Hot Barbecue”) and the great Rahsaan Roland Kirk (“Kirk's Work”), McDuff laid down some serious key work in his day.