Historical clue formulations

• Shaggy hairstyle — 2026-05-04
• Unruly '60s hairdo — 2024-03-18
• Mod do — 2022-05-26
• Hairstyle popularized by the Beatles — 2021-05-19
• Shaggy hairdo — 2021-05-04
• Beatles-like hairdo — 2021-04-13
• Beatlesque hairstyle — 2020-03-21
• Shaggy do — 2018-06-01
• Beatle, endearingly — 2007-10-16