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 - Sinfonia Concertante for Violin, Viola and Orchestra in E-flat major, KV 364, R. Twardowski -- Concerto for violin and string orchestra, 1st Movement, S. Prokofiew - Violin Concerto No. 2 in G minor, Op. 63 , 1st Movement.