George Van Eps was a quiet legend among jazz guitarists, one who as far back as the 1930s pioneered a harmonically sophisticated chordal/lead style that was eclipsed in influence by the single-string idioms of Charlie Christian and Django Reinhardt. Yet Van Eps, like his brassy colleague Les Paul, also stood apart from them as an iconoclastic inventor, designing a seven-string guitar in the late '30s that adds an extra bass string. Thus, Van Eps was able to play basslines simultaneously with chords and lead solos, a jazz equivalent of fingerpicking country guitarists like Merl...