Actor, writer and musician Billy Bob Thornton has been an unconventional and unforgettable presence, from his Oscar-winning "Sling Blade," to his rock band, The Boxmasters. He's now back in Season 2 of the Paramount drama series Landman set in the oil fields of West Texas. Thornton talks with Lee Cowan about his hillbilly roots, music, and the milestone of turning 70. | CBS Sunday Morning