Possible Clues:

• 'Rocky Balboa' studio
• Vegas-based corporation ___ Mirage
• Ted Turner purchase of '86
• 'Rocky' studio
• Big name in musicals
• '30s employer of the Marxes
• "Singin' in the Rain" production company
• 'Singin' in the Rain' production company
• Studio with a roaring lion logo
• 'The Magnificent Seven' studio