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 BEETHOVEN - Violin Sonata No. 8, 1st mov. Allegro assai, Ruben Reina & Paulo Brasil - Massenet Meditation for Violin, Beethoven - Sonata for piano and violin No. 8 - Allegro vivace