Instrumental Duet,Piano Harpsichord,Instrumental Duet,Organ,Piano - Level 5 - Digital Download SKU: A0.990429 Composed by Mitch Boucher. Baroque,Instructional. Score and parts. 2 pages. Mitch Boucher #5751247. Published by Mitch Boucher (A0.990429). This keyboard work is devilishly difficult and it breaks a few rules.