Instrumental Duet,Piano Cello,Instrumental Duet,Piano - Level 2 - Digital Download SKU: A0.511940 Composed by Traditional. Arranged by Bragi Thor Valsson. Praise & Worship,Sacred,Spiritual. 4 pages. Bragi Thor Valsson #6471885. Published by Bragi Thor Valsson (A0.511940). A duet arrangement of the well-known Spiritual Nobody Knows The Trouble I've Seen for two cellos with piano accompaniment. The piece is in C Major.