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 Ukulelen-Teekistenbass-Blues, Swingin on a star - Ukulele, Bass und Ei, What does the christmas tree on the beach of Waikiki? - Ukulele (original)