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 All I Have To Do Is Dream - Everly Brothers on Solo Ukulele - Colin Tribe on LEHO, "America" from West Side Story on Ukulele, Sloop John B Strum and Melody