Sony-Led Group to Acquire MGM for \$3B LOS ANGELES - A consortium led by Sony has agreed in principle to acquire famed Hollywood studio Metro-Goldwyn-Mayer for nearly \$3 billion, MGM said late Monday.    The deal marks the last chapter in the history of two of Hollywood's most storied names - MGM, once best known for its musical hits like "Singing in the Rain" and "Meet Me in St...