Spotify and Youtube offer some full-length opera and ballet recordings, but you have a LOT more quality options when using IU-provided materials.
Provides online access to titles from the Naxos and Marco Polo catalogues plus selected titles from other labels.
Primarily classical music, but also some coverage of jazz and world music. Due to copyright restrictions, some titles are not available in the United States.
To utilize the Naxos player on your smartphone:
Tip: to avoid seeing results for "highlights" recordings, use the word "complete" in your search to return recordings that feature the full, complete opera or ballet (not just the highlights)