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 J. Sibelius -- Serenade nr.2 for violin and orchestra op. 69 (http://valentinzhuk.org/), J. Sibelius -- Serenade nr.1 for violin and orchestra op. 69 (http://valentinzhuk.org/)