Paul Bley, a tremendously influential, leading-edge pianist for more than seven decades, died of natural causes on Jan. 3, at age 83, in Stuart, Fla. Trained in bebop, Bley found his way to a wistful, introspective version of the avant-garde that felt chamberlike in temperament, on essential albums under his own name (1965’s Closer, on ESPDisk’) and not (Jimmy Giuffre’s landmark Free Fall, from 1963). Bley performed many compositions by his first wife, the composer and pianist Carla Bley, rightfully elevating her profile, and became renowned for his solo piano performances, especially the 1972 ECM release Open, to Love, a classic in the format. Among his other credits are concerts and/or recordings with a who’s who of historic musicians, from Lester Young and Ben Webster to Charles Mingus and, during…