Historical clue formulations

• Sings about — 2023-04-15
• Betrays, in a way — 2020-05-11
• Betrays, as to the cops — 2019-10-07
• Betrays, in a way — 2018-08-12
• Outs, in a way — 2010-01-15
• Fingers — 2003-08-31
• Exposes, in a way — 1999-07-23