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 Pauline Haas (harp) - pedals in Wagner / Liszt - la Mort d'Isolde, Die Alte KV 517 - Mozart / Duo Ave Lyra, Pauline Haas (harp) plays Mozart (3/3) - Sonata in F major KV 332