Running through Al Kooper's maze of bands, collaborations, and solo records is the singer/keyboardist's fascination with blending rock, R&B, and jazz. He's been honing this style since the '60s: Early Blood, Sweat & Tears gems like “I Can't Quit Her” feature his husky, soulful vocals flanked by bold brass, while “Season of the Witch” is a psychedelic jam recorded with Stephen Stills, whose bluesy phrases battle Kooper's greasy organ. But his unique mix is epitomized in 2008's “I Love You More Than Words Can Say,” a subtle merger of hard-rocking guitar and Stax-like grooves that feels like the work of a true veteran musician.