The first successful application for a sound mark was registered in 1978 and was filed by NBC. Thirty-five years out, it is still a notoriously long and difficult process. So when I'm asked by another business owner if they can trademark a sound, I always have to give a "yes, but..." answer for the following reasons.
My kids' current favorite show is Shark Tank, where budding entrepreneurs pitch ideas to a team of corporate tycoons who double as potential investors. While listening to concepts for, among other things, collapsible kayaks and colored fur spray for dogs, my daughters vigorously interrogate the television.