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 Johann Gottlieb Naumann - Piano Concerto in B-flat major (1793), Georg Abraham Schneider - Sinfonia Concertante in D-major for violin & viola, Op.19, Ernst Fabritius - Violin Concerto in D-minor