sentence: roles orchestration voice : 4 soprano , 2 mezzo-soprano , 1 alto , 2 tenors , 3 baritone , 2 bass , boy soprano , satb chorus instruments : 2 flutes , 2 oboes , 2 clarinets , 2 bassoons , 4 horns , 3 trumpets , 3 trombones , 1 tuba , timpani , 2 percussionists , harp , strings .