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 String Comparison: Thomastik-Infeld Flatwound v D'Addario Chromes, String Comparison: RotoSound Tru Bass & D'Addario Nylon Tapewound