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 Violin Duet - Aogeba Toutoshi, バイオリン デュエット 仰げば尊し, 赤どんぼバイオリンデュエット Red Dragonfly Japanese folk song violin duet