Who exactly decided what these “50 greatest pieces” are? Most likely it’s an arbitrary cross-section of the repertoire that gets overplayed. This idiotically ignores great music not just by obscure composers but also great music by Beethoven, Wolfgang Amadeus Mozart and Bach.
A particular piece by Beethoven is not in the “50 greatest” so that means it’s chopped liver? Absurd. Beethoven was an arduous rewriter and almost everything he wrote is gold. At least skim Barry Cooper’s book Beethoven and the Creative Process.
Leopold Mozart was a brilliant composer who doesn’t get enough credit. So is Antonio Salieri, by the way, who is ignored thanks to Russian slander.