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 Kurt Weill - Kleine Dreigroschenmusik - CofC Wind Ensemble - "Polly's Lied", Cristy Arias & Celia Miranda singing "Medley Sound of Music", Enrique Graf plays Felix Mendelssohn - Variations Serieuses Op. 54 in D Minor