Operas — Stories, plots, etc. -- Juvenile literature — Audiobooks
The Pinafore Picture Book: the Story of H.M.S. Pinafore
by W. S. (William Schwenck) Gilbert
Stories from Wagner
by J. Walker (Joseph Walker) McSpadden, Richard Wagner
Great opera stories : taken from original sources in old German
by Millicent Schwab Bender
The story of the Rhinegold (Der Ring des Nibelungen) told for young people
by Anna Alice Chapin