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 28" Sabian Symphonic Gong with Friction Mallet (Demo from Artdrum.com), 32" Mercury Gong with M6 & then M6 & M3 Mallets (demo from Artdrum.com)