TTBB choir unaccompanied - Medium - Digital Download SKU: MQ.1.3673-E Composed by Felix Bartholdy Mendelssohn and Philip Biedenbender. 8 pages. Galaxy Music Corporation - Digital #1.3673-E. Published by Galaxy Music Corporation - Digital (MQ.1.3673-E). English. Psalm 121:1-3.This setting for TTBB ensemble re-envisions Mendelssohn's popular movement from Elijah. It is a good challenge for a younger TTBB ensemble and is also rewarding for an adult ensemble.