Historical clue formulations

• Wind pipe? — 2026-05-16
• Grandfather clock sound — 2026-03-09
• Sound heard every hour, perhaps — 2024-07-12
• Doorbell sound — 2022-05-24
• Add a comment, with "in" — 2017-09-22
• Doorbell sound — 2015-05-18
• Doorbell sound — 2012-01-24
• Doorbell — 2009-08-31
• Bell tower sound — 2006-07-11
• Sound heard hourly from Big Ben — 2005-11-21
• Sound on the hour — 2001-11-20
• Ring — 2001-05-24
• Doorbell — 1994-10-12
• Ding-dong — 1993-12-04