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 Jasun Tipton's Progressive Shredoholic II Sampler, Marcos De Ros' Advanced Guitar Techniques Sampler, Marcos De Ros & Pablo G. Soler's South American Guitar Masters Sampler