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 [Harp cover] Corynorhinus (Batman Begins OST) - J. Newton Howard / H. Zimmer, Video collaboration docjazz4 - Zelda's Lullaby harp