Oscar-winning Titanic composer James Horner has created a new theme for CBS Evening News With Katie Couric, which will debut September 5. The network declined to release a snippet of the music Wednesday. "It's memorable when you hear it, and it feels like it fits us," said Rome Hartman, executive producer of CBS Evening News. Horner won Oscars for best original score for Titanic and best song for "My Heart Will Go On" from Titanic. He also has received nominations for his work in Braveheart, Apollo 13, and An American Tail. The existing theme has been in place since 1991....