Historical clue formulations

• Sister of Erato — 2017-04-30
• One of the Muses — 2012-08-30
• Sister of Clio — 2011-04-22
• Muse of music — 2008-02-17
• Goddess depicted holding a flute — 2006-06-03
• Musical Muse — 2002-07-28
• Colleague of Calliope — 1995-05-28
• Muse whose symbol is a flute — 1994-04-09