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 Michael Hersch - "of ages manifest" for unaccompanied saxophone - movement no. VII, Michael Hersch - Last Autumn - recording trailer, Michael Hersch: "in the snowy margins" for unaccompanied violin