Instrumental Duet Bassoon,Flute,Instrumental Duet - Level 1 - Digital Download SKU: A0.648385 Composed by Leopold Mozart. Arranged by Nick Lacanski. Classical,Concert,Instructional,Standards. Score and parts. 4 pages. Theupperstaff #3432677. Published by theupperstaff (A0.648385). This is a great two voice composition by papa Mozart.