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 Joseph & Michael Haydn, Horn Concertos 1, Chicago Symphony Brass Ensemble: J. S. Bach "Sarabande and Minuet", Philip Farkas Plays Horn: Alexandre Glazounow "Reverie"