Historical clue formulations

• "Musetta's Waltz" opera — 2013-07-24
• Inspiration for "Rent" — 2008-05-07
• Opera that opens on Christmas Eve — 2007-06-09
• Basis for the musical "Rent" — 2007-01-31
• Anna Moffo made her American debut in it — 2002-03-23
• Basis for "Rent" — 1999-07-02
• 1896 Teatro Regio premiere — 1998-01-08
• Debut at Turin, 2/1/1896 — 1996-02-04