CALEDONIA, Wis. - Some of the most sought-after handcrafted cowbells in the country are made in a Caledonia garage by the hands of Ulisis Santiago – or "Uli," as he is known to his close friends.

The cowbell, modeled here by Swiss bovine Sophia, is, in many ways, rock and roll's secret weapon. Sometimes, it's just what a song needs to go from good to great. Credit: Photo by Maria Feofilova.

Will Ferrell put his world-renowned, incredibly specialized musical talent to good use over the weekend, popping up for a cowbell cameo during his son Magnus Ferrell’s set at a special charity event.