Scope and Contents Messe : a 2 choeurs et 2 orgues / Bruce Larsen, Charles Widor. Judging from the photocopied score of the original by Widor, this Mass was written for two organs and two choirs (choir I: baritones; choir II: sopranos, altos, tenors, and basses). Besides this original published score, the majority of the music included in this file is made up of Bruce Larsen’s arrangement for violins I, II; viola; celli; bass; trumpets I, II, III; trombones I, II, III; horns I, II; harp, and...