A previously unknown string trio by Wolfgang Amadeus Mozart was discovered in the Leipzig Municipal Libraries, dated around mid to late 1760s when Mozart was a young teenager. The piece has been catalogued as Serenade in C KV 648 and named "Ganz kleine Nachtmusik".
You can listen to the full performance here: [2024.9.19 World Premiere in Salzburg] [2024.9.21 German Premiere in Leipzig]