Historical clue formulations

• Musical counterparts of flats — 2025-08-04
• Elevated pitches — 2024-12-13
• # # # — 2024-09-11
• ### — 2011-06-12
• Experts, slangily — 2006-05-28
• Staff members — 2006-05-05
• Experts — 1998-10-03
• They might raise quarters — 1998-01-17
• Note elevators — 1995-11-19