Trombone Duet Trombone - Level 2 - Digital Download SKU: A0.1192652 By Traditional. By Traditional. Arranged by Bragi Thor Valsson. 19th Century,Folk,Praise & Worship,Religious,Sacred. Score. 7 pages. Bragi Thor Valsson #792098. Published by Bragi Thor Valsson (A0.1192652). An arrangement of the hymn Down To The River To Pray for two Trombones with Piano accompaniment. Two versions are provided - for trombones in Bb (treble clef) and trombones in concert pitch (bass clef).