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 Gordon Jacob: Sonatina for Oboe and Harpsichord (or Piano) (1962), Lou Harrison: Concerto for organ with percussion orchestra (1973) Mov.5, Alfred Schnittke: Yellow Sound (1974) 3/3