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 Chicago Fire Dept - Chicago 2-1-2 The FULL Version, Chicago Fire Dept. - Throop and Harrison 5-11 Alarm w/ 4 Specials 1967, Chicago Fire Dept. - 3-11 Alarm 6350 N. Clark 1968