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 Salt Creek: Banjo and Guitar, IIIrd Tyme Out at Bean Blossom 09: Blue Moon of Kentucky and Swingin the Nine Pound Hammer, Roanoke: Mandolin and Guitar