This composer finished just 3 scenes of "Olav Trygvason"; they're sometimes performed as a cantata
[DOC] [TLE] Alfred 00-PROBK00500 Pro Art Trombone and Baritone Method ... [PAR] Dec 25, 2007 ... it's also present in the Easter cantata BWV 31, "Die Himmel lacht, die Erde ... they'
re given energetic performances, with Richter giving his trombonists fairly a 
workout Olav Trygvason, Op.50: download for free Olav Trygvason, Op.50: .... -act
-iii-trombone-1-2-and-3-parts-qty-2-each.