Possible Clues:

• Ring producer 2 criticised early in his career
• German who composed The Flying Dutchman
• Richard . . . . . . composed The Flying Dutchman
• Composer of Tannhauser
• 'It Takes a Thief' star Robert
• .Composer of 'The Flying Dutchman'
• Including extra note, be a better composer
• 'The Ring of the Nibelung' composer
• Ring composer
• Composer bet about closure of production