Instrumental Duet Instrumental Duet,Trombone,Trumpet - Digital Download SKU: A0.1140317 Composed by Wolfgang Amadeus Mozart. Arranged by Austin Ralphson. Classical. Score and parts. 4 pages. Austin Ralphson #740573. Published by Austin Ralphson (A0.1140317). Mozart composed these 12 duets for two horns and published them in 1786 in the key of C. I have carefully rearranged them here, changing the key and including appropriate articulations to suit the instruments. Parts are provided in concert pitch bass clef and B flat treble clef. This listing is for one duet out of the twelve - you can buy a complete book of all 12 duets for $19.99 here: https://armusiconline.com/b/sC4a7.