Instrumental Duet Harp,Instrumental Duet,Trombone - Level 5 - Digital Download SKU: A0.534558 Composed by Jan Freidlin. Concert,Contemporary,Standards. Score and parts. 12 pages. Musik Fabrik Music Publishing #4301065. Published by Musik Fabrik Music Publishing (A0.534558). A modern work which uses aleatoric notation in an expressively lyric atmosphere.