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 Learn Sibelius 6 in 1 Hour - Lesson 3, Mouse entry, Writing for Percussion with Claire Edwardes part 2, Composing for the Marimba with Claire Edwardes