Historical clue formulations

• Inverse of kilo- — 2026-02-25
• Prefix meaning "one-thousandth" — 2025-12-31
• ___ Vanilli (1980s-'90s R&B duo) — 2022-11-20
• Pop music's ___ Vanilli — 2019-01-09
• ___ Vanilli, group with three #1 hits in 1989 — 2018-02-26
• Prefix with liter — 2015-06-08
• Prefix with second — 2014-04-04
• Pop's ___ Vanilli — 2011-08-11
• Pop music's ___ Vanilli — 2006-10-26
• Music's ___ Vanilli — 2006-09-14
• Pop music's ___ Vanilli — 2002-01-04
• Rock's _____ Vanilli — 1994-08-15