Historical clue formulations

• Choir composition — 2019-01-03
• Chorus, e.g. — 2012-04-22
• Choir — 2003-05-02
• 1-Down, e.g. — 2000-05-15
• Glee club members — 1995-03-31
• Anagram of 56-Across — 1994-04-20