One of the all-time giants of the Hammond B-3, Jimmy McGriff (April 3, 1936 -- May 24, 2008) sometimes gets lost amid all the great soul-jazz organists from his hometown of Philadelphia. He was almost certainly the bluesiest of the major soul-jazz pioneers, and indeed, he often insisted that he was more of a blues musician than a jazz artist; nonetheless, he remained eclectic enough to blur the lines of classification. His sound -- deep, down-to-earth grooves drenched in blues and gospel feeling -- made him quite popular with R&B audiences