Historical clue formulations

• What most clarinets are tuned to — 2022-02-24
• Starting key of 35-/43-Across's "Starman" — 2016-01-26
• A sharp equivalent — 2015-08-30
• Key of Mozart's last piano concerto — 2015-04-29
• Highest and lowest black key on a piano — 2013-09-04
• A neighbor — 2004-10-24
• Key of Schubert's Symphony No. 5 — 2001-12-24
• Note above A — 1994-01-15
• Common key signature — 1994-01-04