Instrumental Duet,Piano Instrumental Duet,Piano,Violin - Level 5 - Digital Download SKU: A0.1450487 By Heidi Thomas violin, Robert Hart piano. By Robert Hart. 20th Century,Chamber,Contest,Festival,Folk,New Age. 4 pages. Rhartmusic #1030169. Published by rhartmusic (A0.1450487). Musical invention that delvelopes every 2 measures.