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 W.F. Bach: Sonate C - Siebe Henstra (clavichord), JS Bach: Fantasia & Fuga BWV 922 - Siebe Henstra (clavichord)