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 Schumann: String Quartet in A Major, Op.41, No.3 - 3. Adagio molto, Beethoven: Quartet in G Major, Op.18 No.2 - 2. Adagio cantabile, Brahms: Viola Quintet in G Major, Op.111 - 2. Adagio