Nigel Hall is a Grammy-winning keyboardist and singer who carries on in the tradition of Art Neville, but with his own powerful voice and musical sensibilities, rooted firmly in modern jazz and funk. Hall can be heard with a variety of groups including his own band, but is probably best known as the funky-psychedelic-R&B keyboardist with the jam band Lettuce. His recent solo album, “Spiritual,” reflects Hall’s individual creativity and spiritual sensibilities.