Instrumental Duet Horn,Instrumental Duet - Level 3 - Digital Download SKU: A0.919583 Composed by Giulio Marco Bordogni and Randal Adams. Arranged by RAdBrass Music. Instructional,Romantic Period. Score and parts. 53 pages. Randy Adams #3476569. Published by Randy Adams (A0.919583). Horn in F Duets based on Bordogni Vocalise Studies - These duets are excellent teaching tools and have been used for many years in the Sam Houston State University Trumpet Studio. The duets have been transposed for Horn in F and may be played alone or with SmartMusic Bordogni accompaniments (transposed). Intermediate difficulty level. Duet parts composed by Randal Adams, Professor of Trumpet, Sam Houston State University. Published by RAdBrass Music.