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 Louisa Schottische and Bandurand Polka - Early American Banjo Music, Banjo Polka by Cammeyer - Zither Banjo, Scottish Lute Tunes arranged for Tenor Banjo Part 1