Historical clue formulations

• Style point? — 2025-07-20
• With 63-Across, singing group ... or a hint to the ends of the answers to the four starred clues — 2019-12-24
• A cappella genre — 2018-03-14
• Place to have locks changed — 2000-07-14
• Place to have one's head examined — 1994-07-11