Historical clue formulations

• Japanese zither — 2023-11-25
• One may be played by a geisha — 2013-11-02
• Japanese stringed instrument — 2011-12-25
• 13-stringed Japanese zither — 2005-02-03
• Japanese stringed instrument — 2001-07-15
• Japanese zither — 1999-05-11
• Instrument with 13 strings — 1995-06-11