(Reuters) - Donna Summer's 1977 hit "I Feel Love" was added to the United States' archives on Wednesday, six days after the disco queen's death, along with Prince's "Purple Rain" album and 23 other recordings deemed cultural or historical treasures. The National Recording Registry of the Library of Congress in Washington DC also added the album "A Charlie Brown Christmas", the voice of late journalist Edward R. Murrow, and Dolly Parton's 1971 autobiographical song "Coat of Many Colors" to its collection. ...