Richard Wagner’s Lohengrin is an opera that was completed in 1848 and is scored for a large orchestra, stage musicians and of course, singers. The clarinet section comprises four parts: 1st, 2nd, 3rd and bass clarinets. The 1st and 2nd parts double on A, B-flat and C instruments. The 3rd on A and B-flat. The bass clarinet part is written in A and B-flat.