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 Soundiron Rust 3 - Walk-through - "The Sound of Iron Oxides", Soundiron - Harp Guitar - "Determination" Demo Walk-through by Sean Gordon, Soundiron Elysium Harp - Gareth Coker - The Cedar Forest