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 David Beede & Aaron O'Rourke - Buckets of Rain - Mt. Dulcimer and Fretless Bass Dulcimer, Bing Futch & Stephen Seifert - Cluck Ol' Hen "Juked" by Bing - dulcimer duet 2010