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 Stefan Milenkovich & Pacifica Quartet: E. Chausson Concerto for Violin, Piano, and String Quartet, Stefan Milenkovich - Tchaikovsky Violin Concerto in D Major, Op. 35 - Canzonetta: Andante, Stefan Milenkovich: J. Sibelius Violin Concerto First Movement Part 2