Misc: Whose autobiography is entitled "Life is a Roller Coaster"?

Questions

Copycats: This group has had 4 remakes hit top ten, with two going to #1.?

Country music star with big cowboy hat who has albums like _No Fences_?

Country Music : Country group: The Kentucky ___________.?

Country Music : Country song: "Here's a quarter; call someone ___ _____."?

Country Music : He stutters when talking, but not when singing.?