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 Sonic & Knuckles Music - Hidden Palace Zone (Remastered), Syllix - Lost [Emotional Piano Music], Logic Pro 9 Tutorial: How to create an Ambient Soundscape / Morphing Evolving Pads