Violin and Viola Duet. Published in score form. Unaccompanied. Portraying the passionate, complex relationship that often develops between two people dancing the tango, this intriguing set of 13 duos for violin and viola convey a variety of moods … impulsive, mysterious, boastful, impatient, animated, longing, frivolous, etc. As the title implies, the first 12 of these musical sketches are about one minute in duration; the closing Cancion is a bit longer.