Thurl Ravenscroft

Thurl Arthur Ravenscroft (born February 6, 1914-died May 22, 2005) was an American voice actor and bass profundo best known as the deep voice behind Tony the Tiger's "They're grrreat!" in Frosted Flakes television commercials for more than five decades. Ravenscroft was also known, however uncredited, as the vocalist for the song "You're a Mean One, Mr. Grinch" from the classic Christmas television special, Dr. Seuss's How the Grinch Stole Christmas.