Mozart’s famous statement to his father concerning this unique and singular quintet for piano and winds, scored for piano, oboe, clarinet in B flat, horn in E flat, and bassoon, should not be forgotten: “I myself consider it the best thing I have yet written in my life.” The only relevant source for this new Urtext edition is Mozart’s clean and almost error-free autograph score, preserved today at the Bibliothéque nationale in Paris. A page of music with a spurious ending was smuggled into it, a fact revealed (and elucidated) for the first time in the present Henle edition.