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 Jazz Band Demo - Xylem 5 String Bass & Jazz Guitar, Xylem 6 String Bass Solo - Villex Pickups, Delay, Tapping, 5 String Bass - Two-Hand Tapping with Delay - Xylem Basses