Melissa, I was a Girl Scout through high school. I was sent to the Roundup in Idaho in 1965. We travelled cross-country by train, sleeping in Pullmans and dining at picnic tables in cattle cars. The train got longer as we approached Idaho. The wait-in-line-for-a-meal song became "Wemoweh" and it was magnificent. But I don't remember "Rock, Rock"

Animaterra, if the words were different, please post them.