Sheet Music

The two Duos KV 423 and 424 for violin and viola were composed by Wolgang Amadeus Mozart during a visit to Salzburg in 1783. They were part of a set of six Duos which Michael Haydn, younger brother of Joseph Haydn, was commissioned to compose for the Archbishop of Salzburg. Because of a serious illness Michael Haydn only managed to complete four of the required six Duos. For this delay he was threatened with the forfeiture of his composition fee.
Mozart, as a good friend of Haydn, visited him daily while in Salzburg and helped him out of this difficult situation by composing the remaining two duos for him.

They were handed in as part of the set of six duos under Michael Haydn’s name. The Archbishop did not detect in them the obvious signs of Mozart’s unique style and skill.
Some years later Mozart asked for the Duos to be returned to him, whether as a copy or as his original manuscript is unknown. In 1792, only a few months after his death the first edition was published. Possibly this was instigated by Mozart himself but there is no proof.
In the Duetto secondo KV 424 both instruments are treated as equal partners, resulting in a musical dialog throughout the work which was stylistically unusual at that time.
Among the various editions of the Mozart violin and viola duos, a facsimile of the original hand script was also used as a basis and reference for this arrangement for flute and alto flute.

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