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 Bluthner Grand Piano part 3 - fine tuning, Acoustic vs digital pianos - difference in tone and touch; Roberts Pianos, Acoustic v Digital - How do I Choose Between an Acoustic or Digital Piano?