This is another reason why free software and cc0-licensed musical instruments are so critical. They allow us to take back public domain music that is normally locked up behind copyrighted performances. Want Bach's Art of Fugue? You can scour the internet and not find a public domain recording. Or feed it plus a cc0-licensed harpsichord into free software and get output that is not only free but better: better tuning, more accurate rhythm, less noise, no pesky ornamentation, not on a Steinway!
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However, if you are content with equal temperament and a 1900s-style Steinway, Bach's Art of Fugue does appear to be one of the few works available under cc0: https://commons.m.wikimedia.org/wiki/Category:Audio_files_of_Libre_Art_of_the_Fugue
