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 The Ozark Highballers - Billy In The Lowground - Old Time Fiddle and Harmonica, The Ozark Highballers - Old Time Harmonica, Fiddle and Guitar - Charleston #2