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 "Jingle Bells" / "Bjelleklang" - The Cello Advent Calendar - December 3rd, "The Mouse Song" / "Musevisa" - The Cello Advent Calendar - December 1st