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 Ukulele Lesson -"Twinkle, Twinkle, Little Star", Ukulele Tuning and Holding - Free Ukulele Lessons, Baritone Ukulele Lessons - Scales- Part 1