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 Canon in D (guitar, violin, & flute trio), Minuet in G (Guitar, Violin, & Flute trio), Jesu, Joy of Man's Desiring (guitar, violin, & flute trio)