On July 12, 1969--some 51 years ago--Glen Campbell visited "The Johnny Cash Show" and sat down with Johnny, the duo performing a medley that was something of a musical travelogue. It included "I've Been Everywhere", Jimmy Webb's "By The Time I get To Phoenix" and "Galveston", and Johnny Cash's "Folsom Prison Blues" and more... "I've Been Everywhere" was written by Albert Geoffrey McElhinney, an Australian country singer better known by his stage name Geoff Mack. GLEN CAMPBELL Should Be In The Ro