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 P.I. Tchaikovsky Concerto for Violin and Orchestra in D, Op. 35, Magnard Quintet for Flute, Oboe, Clarinet, Bassoon and Piano in d, Op. 8 (1895), Heinrich Schutz Magnificat