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 Detailed Sheep Heart Dissection: Part II (Jr. High, High School and College Review), Detailed Sheep Heart Dissection: Part I (Jr. High, High School and College Review), Peg + Cat Save the World