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 Monroeville - "Country Blues" - Grey Fox 2012, Della Mae, Sledd Ridin', Grey Fox 2010, Fiddle Masters - Grassy Fiddle Blues - Grey Fox 2011