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Piano Sonata No. 9 in D major, K. 311

I. Allegro maestoso

Wolfgang Amadeus Mozart · 1777 · D major · 112 bars · 316 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: D major, A major, B minor, G major.