Stump the chumps

I'm a sports fan. I love the fact that I have two sports radio stations to choose from when I'm driving around town (which is rare because I work from home). Fridays on 810 is my favorite. Stump The Chumps. Pete Enich is a sports history freak of nature. I've heard him argue down an obstinate caller claiming they have the web page right in front of them that proves so-and-so started the whatever game in 1967. Pete can invariably come back with "I don't care what your website says, I was at the game." Today's trivia question is sports in honor of the 810 gang. In the 1970's what Royals pitcher would enter the game with John Denver's "Thank God I'm a Country Boy" blasting over the stadium PA? And by the way, I know this because I was usually "at the game."