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 Frederick Delius - Légende for Violin and Orchestra (1895), Bach - Violin Partita No. 3 in E major, BWV 1006 {Grumiaux}, Mozart - Adagio for violin & orchestra in E major, K. 261 (1776) [Grumiaux]