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 "Old-time music on Bob Smakula's porch", "Yankee Doodle" with fiddle, tenor guitar and tackhead banjo, "Shortnin' Bread" Fiddle & Banjo duet