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 Offworld Percussion Tenor Pad / Tenor Cajon Prototype NAMM, Meinl 10" Double Row Super Dry Studio Tambourine - Steve Weiss Music, Horacio "El Negro" Hernandez Cowbells