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 Moscow Nights played on a 6-chord zither, Variations on Pachelbel's Canon - Etienne de Lavaulx on 5-chord zither, Vivaldi Largo played on a 6-chord zither by Etienne de Lavaulx