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 Roland White plays Rudolph The Red-Nosed Reindeer - mandolin with guitar, What Child Is This? Roland White Mandolin Christmas music, Roland White Demonstrates "G Chop" Chords for Mandolin