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 Haydn: Cello Concerto No. 1 in C Major - I Virtuosi del Teatro alla Scala | Classical Music, Opera Arias on Piano: Nessun dorma - Va, pensiero - La donna è mobile… | Classical Piano Music