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Piano Sonata No. 17 in B♭ major, K. 570

I. Allegro

Wolfgang Amadeus Mozart · 1789 · B♭ major · 209 bars · 243 chords analysed

Mozart's 18 piano sonatas span his career, from Munich in 1775 to Vienna in 1789. Most have three movements — fast, slow, fast — and the first movement is usually in sonata form: two contrasting themes, a development that travels through other keys, and a return home.

Keys visited: B♭ major, F major, D♭ major, C minor, G minor.