Though he was a late bloomer (he didn't start playing organ until age 28), Jimmy Smith is the single most influential figure in the history of jazz organ. He was the pioneering force in making the organ a lead instrument. And while he had bebop chops aplenty, his blues/R&B influences and preference for space over clutter also made him an icon of the subsequent acid jazz movement. Though his heyday was in the 1960s, the larger-than-life organist blazed ahead for decades afterward, until his death in February 2005.