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 Nino Rota "Trio for flute, violin and piano" 1st movement - Duo Barrenechea and Mabio Duarte, violin, Gnattali "Sonatina" mov 2 - Duo Barrenechea