Historical clue formulations

• Fluctuate between normal singing and falsetto — 2026-01-15
• Alpine call — 2024-01-16
• It might end on a high note — 2023-03-12
• Belt out in the mountains — 2022-10-14
• High number? — 2022-06-16
• Emulate the Lonely Goatherd — 2022-02-24
• Make a long-distance call? — 2022-02-19
• Sing in a high range? — 2022-02-09
• Communication during peak times? — 2021-04-13
• Cliff notes? — 2018-10-19
• Go through a voice change? — 2018-09-29
• Long-distance call? — 2017-06-09
• Alpine call — 2015-09-30
• Sing "lay odl lay odl lay hee hoo" — 2015-03-02
• Peak performance? — 2014-11-09
• Demonstrate a wide range on a range? — 2014-01-25
• Song in the Alps — 2013-09-10
• Mountain song — 2013-04-09
• Call that might result in a 27-Across — 2011-11-30
• Mountain air — 2008-08-31
• Call in the Alps — 2008-06-23
• Tyrolean refrain — 2007-03-02
• Song from on high? — 2006-01-22
• Mountain air — 2005-05-08
• Tyrolean cry — 2005-03-20
• Alpine song — 2004-12-06
• Call from Switzerland — 2004-10-22
• Alpine song — 2004-08-16
• Sing in the Alps — 2004-03-22
• Alpine call — 2003-05-06
• Echo producer, maybe — 2002-04-14
• Alpine call — 2001-10-29
• Peak call? — 2001-06-13
• Mountain air — 1999-10-09
• Tyrolean refrain — 1999-04-07
• Alpine song — 1995-07-11
• Alpine song — 1995-04-25
• Mountain air — 1995-03-19
• Novelty song — 1994-11-04