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 Sealed With a Kiss (Harmonica, Melodica, Guitar, Ukulele), Poor Lonesome Cowboy (Ukulele and Harmonica cover), Tears in Heaven (harmonica) - Eric Clapton / The Choir Boys