Beatus Vir was written for SSATTB and organ. The original score suggested that three trombones could be used to double the lowest three voice lines. On some period instrument recordings, cornettos were used rather than violins. This use of brass makes for an easy transition to this present arrangement. This work can be performed with or without choir, with the voice lines being doubled by flugel horns, horns and trombones. This arrangement is for 4 trumpets, 2 horns, 2 trombones, euphonium and tuba.