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 Violin Sonata in E minor K304 (1st Mvt), Vieuxtemps Violin Concerto No. 5 - 2nd and 3rd Movements, Wieniawski Violin Concerto No. 1 in F# Minor - Complete