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 Harpsichord tuning: Well-Tempered Clavier - Bradley Lehman, Harpsichord tuning: Setting Bach/Lehman 1722 by ear, Kirnberger's keyboard temperament, 1771, playing Bach