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 ViVi - Automatic Music Synchronizing LED Controller (WS2812 or Neopixels), ViVi Music LED Controller - Full Song, Automated Sound Responsive LED Light Show, ViVi - Neopixel and WS2812B Sound Reactive RGB LED Controller - Music Variety Demo