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 W. A. Mozart - Rondo alla Turca (Turkish March), solo classical guitar, The Four Seasons, Summer, 3rd mvt, A.Vivaldi (solo classical guitar arrangement by Emre Sabuncuoglu), "Promenade," from Pictures at an Exhibition - Modest Mussorgsky (Guitar Transcription)