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 Molly Tuttle demonstrates a Veillette Avante Gryphon high-tuned 12-string guitar, Collings SoCo Deluxe demo by Rick Vandivier, 2009 Jamie Wiens Loar F-5 "bench copy" Mandolin demo by Larry Chung