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 Handel: Suite in D minor HWV 448, Jan Pieterszoon Sweelinck: Echo Fantasia in a (aeolian), Kindermann: Harmonia organica (1645) - Praeambulum VI - X.