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Operor Libretti
KOMPOSITÖRER
J. S. Bach,Frederic Chopin,Guide to Composer Data and Works Lists
George Gershwin,Gilbert & Sullivan Archive,Gustav Mahler
Giacomo Meyerbeer,Wolfgang Amadeus Mozart,Allan Pettersson
Giacomo Puccini,Franz Schubert,Giuseppe Verdi
Richard Wagner Archive,Finnish Wagner Society