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 Mile High Guitar Ensemble - Golliwog's Cakewalk (Debussy), Roland Dyens - Tango (Albéniz), GFA 2nd Regional Symposium in LA - Guitar Orchestra Performs Intermezzo by Granados