Historical clue formulations

• Key of Mozart's Symphony No. 40 — 2024-08-25
• Key of Mozart's Symphony No. 25 or 40 — 2012-05-22
• Key of Saint-Saëns's "Danse macabre" — 2007-08-27
• Key with two flats — 2005-07-12
• Key of Mozart's Symphony No. 40 — 2004-09-19
• Key of Mozart's Symphony No. 25 — 1997-04-05