Historical clue formulations

• What backup dancers often move in — 2025-03-24
• What choristers may sing in — 2021-05-26
• A group of carolers may sing in it — 2020-08-26
• A choir might sing in it — 2020-08-18
• Togetherness — 2018-10-15
• A choir may sing in it — 2015-03-26
• Simultaneity — 2011-04-17
• Oneness — 2009-07-28
• People often sing in it — 2009-06-26
• Choirs may sing in it — 2007-10-14
• Tandem — 2007-05-10
• A choir may sing in it — 2006-03-13
• Concord — 2005-06-24
• What some singers sing in — 2005-03-04
• Oneness — 2004-03-30
• Accord — 2004-02-20
• Perfect accord — 2003-07-04
• Choirs may sing in it — 2002-04-25
• Something to sing in — 2000-09-24
• Accord — 2000-04-02
• Harmony — 1996-10-09
• Perfect accord — 1994-02-20