Input (grade 12): Stephen Arthur Stills (born January 3, 1945; Dallas, Texas) is an American guitarist and singer\/songwriter best known for his work with Buffalo Springfield and Crosby, Stills & Nash (and Young).
Output (grade 6): Stephen Stills (January 3, 1945 -) is an American singer and songwriter. He is most famous as a member of the groups Buffalo Springfield and Crosby, Stills & Nash.