Alfred Matthew "Weird Al" Yankovic (born October 23, 1959) is an American singer, musician, actor, satirist, parodist, songwriter, accordionist, and television producer. Yankovic is known in particular for his humorous songs that make light of popular culture and that often parody specific songs by contemporary musical acts.
from wikipedia :
Yankovic changed his diet to become a vegan in 1992, after a fan of his gave him the book Diet for a New America and he felt "it made [...] a very compelling argument for a strict vegetarian diet." When asked how he can "rationalize" performing at events such as the Great American Rib Cook-Off when he is a vegetarian, he replied "The same way I can rationalize playing at a college even though I’m not a student anymore."