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 Lone Star Ukefest 2010: Tom McDermott -- Born To Be Wild, She'll Be Coming Round The Mountain for uke in G with chords, That Buckin' Song performed by Mark Levine for Beginner's Uke