Sinfonia Concertante for Violin, Viola, Cello and Orchestra (Mozart)

The Sinfonia Concertante for Violin, Viola, Cello and Orchestra in A major, K. Anh. 104 (320e), is an incomplete composition by Wolfgang Amadeus Mozart.

Background
Mozart is believed to have started work on this concerto around the same time as the Sinfonia Concertante in E-flat major K. 364. For unknown reasons Mozart abandoned the work after writing 134 bars of the opening movement.

Structure
As completed the work consists of a single movement, Allegro.

Completions
Several composers have completed the movement.
 * Around 1870, Otto Bach composed a completion which Dennis Pajot described as having a very obvious join between the part written by Mozart and the part written by Bach.
 * In 1969, Robert D. Levin wrote a completion that was more sympathetic to the surviving material.
 * In 1991, Japanese composer Shigeaki Saegusa wrote a highly original completion, commissioned by the International Mozarteum Foundation.
 * More recently, composer Hans Ueckert announced he was working on a completion for the Octava Chamber Orchestra.
 * Another composer to have made a completion is Philip Wilby.
 * Another completion was made by Italian composer Alessandro Solbiati for I Solisti Aquilani and played first time in Rotterdam during International Viola Congress 2018 (soloists: Daniele Orlando, violin – Gianluca Saggini, viola – Giulio Ferretti, cello).
 * The contemporary Filipino-British composer Jeffrey Ching's three-movement completion, published by Verlag Neue Musik with Ching's original cadenzas, was premiered by the Dresden Staatskapelle under Michail Jurowski in 2017.