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 McGann solo 10 string fanned fret mandolin (mandola) -Shenandoah (Berklee 3/8/11), Berklee Mandolin Mashup 2011 Alex Gable "Karanfi/Santa Morena", John McGann solo mandolin: Honeybee/Prayer Reel/Jenny's Chickens