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 John Hartford - Learning To Smile -04 Way Down The River Roa, John Hartford - Ramblin - 03 - Presbyterian Guitar, John Hartford - Ramblin - 08 - The Six O'Clock Train