From MLSsoccer.com:
In this new occasional series, we check in with supporters’ groups throughout MLS to learn what their favorite chant is and what makes it so special. We start with Centennial 38 (better known as C38), the Colorado Rapids’ mainstays, who transformed a familiar John Denver song into “Mountain Roads Take Me Home.”
Origins
According to Pat Quinn, who heads up the C38 capos, the chant first appeared in 2010. “One of the supporters first introduced it and it gradually started to catch on. I think a John Denver song was picked because he always had a connection with Colorado,” he says.