She was inundated with entries, including a man playing a carrot and a toddler playing the drums, and she's picked the best to appear in her new promo.
Tunstall tells Britain's Sunday Mail, "It was just a throw-it-out-there idea. We really didn't know what would happen. We could have put it out and no-one responded
"One Japanese guy, who's actually quite famous on YouTube, makes instruments out of vegetables. So in my invite, I said you can even make flutes out of carrots and, lo and behold, there he was playing the whistle part on his carrot. That was great."