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 Justin King - Knock on wood - Cover by Lena Mashkina - tapping slapping guitar, Popcorn Song - Piano+Guitar (tapping) Cover (Gershon Kingsley), Lena Mashkina: Tapping "American babe"