By "duplicate", I mean the selfsame piece, performers, and performance.
Disregard the same piece PERFORMED DIFFERENTLY, e.g. different performers or time.
What's duplicated between Pierre Boulez's
- The Complete Columbia Album Collection released by Sony Classical
- vs. Œuvres Complètes = Complete Works released by Deutsche Grammophon?
What duplicates can I delete, if any? I need to free hard drive space.
