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 Falla: El Amor Brujo, by Fritz Reiner with Carol Brice (1946), Nielsen Violin Sonata No. 2 (Erling Bloch, 1938), Roussel: Violin Sonata No. 2 (Alexander Brusilovsky)