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 Music in the Lobby: Molasses Creek, "The Waterman", Music in the Lobby: The Barefoot Movement, "Second Time Around", Music in the Library: Mint Julep Jazz Band, "Swingtime in Honolulu"