American Idol judge Kara DioGuardi and pop singer Michael McDonald made surprise appearances at the Country Music Hall of Fame's All for the Hall fundraiser in Los Angeles on Oct. 1. DioGuardi sang "Lost," one of her original songs that Faith Hill has recorded. McDonald performed "You Don't Know Me," written by Hall of Fame members Eddy Arnold and Cindy Walker. As previously reported, the event featured performances from Vince Gill and Emmylou Harris (who are Hall of Fame members) as well as Dwight Yoakam and Melissa Etheridge. Show host Chris Isaak also covered a Buck Owens rarity, "You Hurt Me So."