Historical clue formulations

• Those playing the king of Egypt in "Aïda" — 2025-10-18
• They often end on a low note — 2020-06-07
• Players of Fiorello and Dr. Bartolo in "The Barber of Seville" — 2019-03-15
• Mozart's Don Alfonso and Leporello — 2018-05-20
• Lowest-voiced choir members — 2017-04-05
• Some singing villains — 2009-01-16
• Some "Rigoletto" performers — 2002-04-19
• Met villains, often — 2000-09-13
• Those playing the role of Boris Godunov — 1997-01-05
• Choir section — 1996-07-05
• Low singers — 1996-04-11
• Ones deeply involved in opera? — 1995-11-07