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 C.F. Martin D-18E Retro - live gig sound examples, Martin CS-OM-13 reviewed by onemanz.com/guitar, C.F. Martin - New 2013 Guitars - a sampler