A Noise reader draws attention to another curious gem in the Library of Congress Jukebox: Felix Arndt's Operatic Nightmare, containing quotations from Wagner, Verdi, and various others. (Not all are listed in the notes to the recording; that's a bit from Act III of Walküre right at the start.) Arndt's Desecration Rag is also worth a listen. Read more about Arndt here.