Historical clue formulations

• One-man band, for example — 2026-04-08
• One putting on a show — 2025-03-01
• Beyoncé became one in 2003 — 2021-02-05
• Something David Copperfield has that Penn and Teller don't — 2020-03-28
• Ex-band member, maybe — 2016-07-14