Bob Dylan and Johnny Cash met at the 1964 Newport Folk Festival and soon formed a tight friendship, culminating in February of 1969 when they spent a few days recording together at Columbia's Studio A in Nashville, Tennessee. They played everything from "Ring of Fire" to "One Too Many Mornings" to "You Are My Sunshine," but the only thing that wound up getting officially released was "Girl From the North Country." It's clearly a little unrehearsed and they even screw up some of the words, but it doesn't matter. It was the perfect way to kick off Nashville Skyline. Hopefully they get around to releasing the entire session on a future edition of Bob Dylan's Bootleg Series.