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 RFTC: Drones fly FPV over Sprint Boat Racing Championship, RFTC: Flying FPV (and inside a balloon!) at the Sequim Hot Air Balloon Festival, RFTC: Micro-Quad vs. Glass Elevator