Historical clue formulations

• Motown legend Lionel — 2025-11-25
• Friend of the Fonz — 2018-11-22
• Havens who sang at Woodstock — 2013-05-28
• Havens for folkies? — 2010-10-22
• Pal of Potsie and the Fonz — 2003-08-15
• 1980's-90's hitmaker Lionel — 2003-07-14
• Potsie's pal on "Happy Days" — 2002-10-09
• "Say You, Say Me" singer, 1985 — 1998-05-10
• "Happy Days" role — 1995-12-02