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 music lesson: La follia di Corelli for recorder, G. F. Haendel, Sonata II, Andante, bass recorder and guitar, recorder lesson, Telemann, Fantasia n. 4 (1/4)