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 Albert Semyonovich Leman - "Monological music" for cello solo, part 1, Albert Semyonovich Leman - 2 pieces from "5 pieces for cello & harp", Albert Semyonovich Leman - "Monological music" for cello solo, part 2