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 Yamaha APX500 Acoustic Electric Guitar Demo | Carl Tosten, Takamine G360S Dreadnought Acoustic Guitar - Brad Davis, Different Ukulele Sizes | Makala Ukulele Sound Comparison