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 Jumpy Horse Show Jumping 1.0 - Brand New Equine Game for iPad and iPhone, DotPen - Redefining drawing and writing on tablets and smartphones, Licking Letters for iOS - Spelling Game with Hoppy the Frog