Related Clues:

• Meyerbeer output
• 'Doctor Atomic' et al.
• ''Norma'' and ''Turandot''
• Sung dramas
• Palm products
• Reduces friction
• Wall paintings
• Works with singers
• Some PBS specials
• Old masters used them
• Works at a museum?
• Some lipids
• They require libretti
• Motor or mineral, for two
• 'The Blue Boy' and others