Historical clue formulations

• High register — 2023-05-28
• Bit of Queen's "Bohemian Rhapsody" — 2018-09-23
• Frankie Valli sang in it — 2013-03-17
• Unnaturally high voice — 2012-03-12
• Vocal style of 10-/25-Down, at times — 2009-07-01
• Certain doo-wopper — 2005-12-03
• Tiny Tim sang in it — 2004-03-12
• Something funny to sing in — 2000-03-02
• Novelty singing feature — 1998-06-30
• Unnatural high — 1997-08-28