- Köchel Number
- K9 357,01 | K6 497a
- Genre
- Piano Music
- Form
- Works for Two Pianos & Piano Four Hands
- Key
- G Major
- Date
- Late Summer 1786
- Place
- Vienna
- Age
- 30
Mozart’s Allegro in G major for piano four-hands (K. 357,01; also transmitted as K. 357/497a) is a brief, unfinished movement from Vienna, dating to around 1786–87. Preserved only as a fragment and often discussed alongside the related G-major four-hands fragment K. 500a, it offers a glimpse of Mozart’s late-Viennese keyboard style in a domestic, collaborative medium.[1][2]
Background and Context
In 1786 Mozart was thirty and firmly established in Vienna, writing at once for the theatre and for the keyboard—both for public display and for private music-making. The four-hands medium, in particular, suited the city’s salon culture, and Mozart’s mature works for it range from genial sonatas to large-scale, concert-like statements.[2]
The Allegro in G major survives as a fragment, and modern cataloguing often links it to the similarly fragmentary G-major companion commonly cited as K. 500a (sometimes transmitted together in early publication history).[1][2]
Musical Character
What remains on the page is a bright, forward-moving Allegro in G major, cast in the confident, symmetrical rhetoric of Mozart’s late keyboard writing: clear phrase structure, lively surface figuration, and cleanly articulated cadences that invite continuation.[1]
Even in incomplete form, the duet texture suggests a characteristic four-hands interplay: one player projecting the melodic foreground while the other supplies rhythmic animation and harmonic ballast, with the parts frequently exchanging prominence. Later editors and arrangers attempted completions, but Mozart’s autograph portion is best heard as a brisk, urbane opening whose missing continuation only sharpens its sense of momentum.[1]