The piece is a 12-minute-long work in C major, written for two violins and a bass.
Based on the compositions approximate timing, Mozart was between 10 and 13 years old when he wrote it.
It looks as if thanks to a series of favourable circumstances a complete string trio has survived in Leipzig.
A Leipzig Municipal Libraries worker holds the lost Mozart manuscript.Photo: Sebastian Willnow/picture alliance / Getty Images
Researchpublished last yearfound that Beethoven had serious liver problems and a hepatitis infection before his death in 1827.
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