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 Janine Jansen: Mendelssohn's Violin Concerto Mvt.3, Violin Partita No. 2 in D minor, BWV 1004: V. Chaconne (arr. for cello ensemble)