Historical clue formulations

• Named names — 2026-08-09
• Named names — 2026-05-03
• Belted out — 2026-02-11
• Did a number, say — 2025-11-22
• Squealed, as an informant — 2025-06-16
• Showed off one's pipes — 2022-03-06
• Performed in a choir — 2022-02-01
• Violated a code of silence — 2021-10-03
• Blabbed — 2019-05-19
• Was a rat — 2018-03-18
• With 42-Across, coolness of mind — 2017-10-11
• Squealed — 2017-04-02
• Serenaded — 2016-04-04
• Was a ratfink — 2015-11-18
• Provided backup, say — 2015-10-02
• Caroled — 2014-07-20
• Provided backup, in a way — 2013-09-06
• Spilled the beans — 2013-02-05
• Turned state's evidence — 2013-01-16
• Violated the "code of silence" — 2012-06-13
• Told all to the cops — 2012-02-22
• Turned state's evidence — 2010-07-28
• Emulated a rat — 2010-04-10
• Spilled the beans — 2009-03-18
• Ratted — 2008-11-28
• Crooned — 2008-09-08
• Auditioned for "American Idol" — 2008-05-25
• Showed disloyalty — 2008-05-15
• Performed ballads, e.g. — 2008-03-31
• Trolled — 2008-03-20
• Did a number — 2008-01-31
• Told all — 2006-06-20
• Was a fink — 2006-06-05
• Warbled — 2006-03-29
• Performed an aria — 2006-02-20
• Ratted — 2005-07-10
• Acted the fink — 2005-03-15
• Was trilling — 2004-04-15
• Was in a choir — 2003-05-26
• Belted out — 2003-04-09
• Turned state's evidence — 2003-01-07
• Blabbed to the feds, say — 2002-12-03
• Named names — 2002-12-01
• Ratted, in mob lingo — 2001-03-13
• Participated in a choir — 2001-02-20
• Belted one out — 1999-08-24
• Warbled — 1999-05-10
• Tattled — 1998-09-25
• Crooned — 1998-09-08
• Caroled — 1997-12-24