Historical clue formulations

• Soothing sound — 2022-04-07
• Bad stethoscope sound — 2019-08-29
• Hushed sound — 2013-05-31
• Complain, in a way — 2010-06-11
• Brook sound — 2007-02-20
• Undertone — 1997-10-03
• Complain, in a way — 1994-11-13