videos in AudioSet
A list of about a million ten-second YouTube clips, each labelled with the sounds in it, that Google published in 2017. Labs use it to train and test general audio and music models.
Including Mozart Duo for Violin and Viola KV 423 Piano Transcription - 3. RONDEAU. Allegro [tbpt43], Mozart - Rondo for Violin and Orchestra KV 269 - Piano Transcription [tbpt92], Mozart Duo for Violin and Viola KV 423 Piano Transcription - 1. Allegro [tbpt43]