A course in which guitar players work in pairs to develop their skills as accompanists, including comping in a wide variety of styles and rhythmic grooves (medium swing, up-tempo, bossa nova, funk, samba, ballad, waltz), "orchestral" accompaniment (as for a vocalist or a lyrical horn player), and applied reharmonization. In addition, guitarists get a chance to broaden their repertoires, and get experience performing in the context of the guitar duo, which is itself a viable artistic and commercial performance format.