Here's a partial list of top male country singers of the last 20 or so yrs :
Tim McGraw - not bald
Dwight Yoakum - not bald
Garth Brooks - bald
Kenny Rogers - not bald
Willy Nelson - not bald
Johnny Cash - now dead, but not bald
So I see only one on that list is bald.
Dwight Yoakum (one of my favorite male country singers) is most definitely at least bald-ING beneath that hat he's been wearing for years- and I suspect that Tim McGraw is in pretty much the same situation.
You might not call it bald, exactly but you'd have to at least admit their hairline has receeded pretty extremely (they just still have a fringe of hair around the bottom of their skulls- and they've left it long- so it looks like they have a full head of hair under there).