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 Danzi: Wind Quintet in B flat major, op.56-1, II. Andante con moto, Schoenberg: Wind Quintet op.26 I. Schwungvoll, Beethoven: Adagio and Allegretto for Musical Clock