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 J.M.Sperger Sonata in D for Cb.&Pf., D.Dragonetti:Andante&Rondo for Solo Contrabass and String Orchestra, G.Rossini Une Larme pour Contrebasse