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 Mann Raptor 5 string electric octave/baritone mandolin, Mann Two Point Octave Mandolin....Oval hole, Mann OSEM-5 Octave Baritone Single cut Electric Mandolin