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 J.S. Bach - Concerto for 2 Harpsichords in C Major (BWV 1061) - Daccapo Italian Harpsichord Duo, J. L. Krebs - Concerto for 2 Harpsichord in A min - Daccapo Harpsichord Duo