One famous book of his was written for children and is called "The Old Possum's Book of Practical Cats". The songs in the Andrew Lloyd Webber musical "Cats" are based on poems in it. He also wrote "The Waste Land", a very mysterious, complicated poem that helped start a new style called Modernism. His friend, Ezra Pound, another Modern poet, helped him finish it. His poem "The Love Song of J. Alfred Prufrock" and his play "Murder in the Cathedral" (about Thomas Becket) are also well known.