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 P.Tchaikovsky - "Dance Fairy of the Dragee from ballet the Nutcracker" - ensemble "Pizzicato Style", V. Semenov - Bulgarian Suite, The Moldavian national dance "The Lark"