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.

Well, now Ferrell has, in a way, reprised his role as the cowbell-playing musician. But this time for his son Magnus Ferrell’s rock and roll show. The comedian offered a cowbell cameo during Magnus’ ...

For the rest of time, the cowbell will be associated less with cows than with Saturday Night Live. During a spoof of the Blue Oyster Cult’s hit, “(Don’t Fear) the Reaper,” actor Christopher Walken ...