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 Song For the Dumped- Ben Folds: Mandolin Cover!, Momma Cried- Alison Krauss and Union Station: Mandolin/Vocals Cover, "Laps in Seven" (Sam Bush) Mandolin Tutorial