The Op. 30 mazurkas, by Frédéric Chopin, are a set of 4 mazurkas written and published in 1837:Mazurkas (4) for piano, Op. 30, CT. 68-71 No. 1, in C minor No. 2, in B minor (ends in F minor) No. 3, in D major No. 4, in C minor

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