Instrumental Duet Instrumental Duet,Organ,Trombone - Level 4 - Digital Download SKU: A0.650435 Composed by Camille Saint-Saens. Arranged by Nick Lacanski. Concert,Instructional,Romantic Period,Standards. Score and parts. 26 pages. Theupperstaff #6497559. Published by theupperstaff (A0.650435).