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 Lili Boulanger, Nocturne pour violon et piano (1911), Guilmant, Deuxième méditation pour orgue op. 20 no. 2 (1866), Hyacinthe Jadin, Trio à cordes op. 2 no. 3 - III. Adagio (1797)