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 W.A.Mozart, violin concerto, K.216, No.3, 2mov., J.S.Bach, The Double Violin Concerto, BWV 1043. 2nd mov. A=432hz