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 Heitor Villa-Lobos: Concerto for Guitar & Orchestra - Cadenza, Quasi allegro, Heitor Villa-Lobos: Concerto for Guitar & Orchestra - III - Allegro non troppo