Historical clue formulations

• Something you have trouble putting down — 2026-01-09
• Singers Patti and Tina? — 2017-06-19
• Book you can't put down — 2016-03-16
• Something that's hard to close? — 2009-05-28
• Summon a cable magnate? — 1999-01-12
• Engrossing book — 1995-09-22
• Patti + Lana — 1994-05-17