Piano Concerto No.20 in D minor (2) Wolfgang Amadeus Mozart Download 'Piano Concerto No.20 in D minor (2)' on iTunes
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Lang Lang: The Chopin Album - an album guide
It's one of Chopin's more technical study-style études, notable for its quick bursts of clashing notes throughout the music. Perhaps unsurprisingly, it's known as the 'Wrong Note' étude.