Question: In between Ludwig van Beethoven and Heinrich Marschner who was the most important composer of German opera between Weber and Wagner?
Sentence (from "Ludwig van Beethoven"): His best-known compositions include 9 symphonies, 5 piano concertos, 1 violin concerto, 32 piano sonatas, 16 string quartets, his great Mass the "Missa solemnis", and one opera, "Fidelio".
Relevant evidence: No