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 Bluegrass Cello Fiddle Tune Jam (five string cello), Bluegrass Cello - Brandywine - Fiddle Tune - Five String Cello, Lost Indian - Fiddle Tune - Bluegrass Cello - Five String Cello