Historical clue formulations

• Musical staff letters — 2024-08-27
• Lines on a staff — 2013-07-07
• Lines on a musical staff — 2008-07-06
• Lines on a staff — 2006-10-29
• Treble clef lines — 2005-04-12
• Staff lines? — 2004-06-19
• Lines on a musical staff — 2002-06-25
• Treble clef lines — 2001-02-21
• Musical scale letters — 1994-05-16