Historical clue formulations

• Musical tone below A — 2020-06-21
• A neighbor — 2015-05-24
• A flat is the same as this — 2013-08-08
• A flat alternative — 2012-12-08
• A flat equivalent — 2012-03-25
• Note in an E major scale — 2009-07-28
• Note in the A major scale — 2000-04-28
• A flat's equivalent — 1997-06-20