Nashville has a reputation, and a well-earned one too: the Tennessee city is the home of country music. But, as the Country Music Hall of Fame points out with a new exhibition opening Friday (Dylan, Cash, and the Nashville Cats: A New Music City, from which the artifacts and photographs above are drawn), that deserved reputation doesn’t mean that Nashville’s musical horizons are limited to one genre alone. Rather, the fact that the city has long been home to accomplished session musicians — like the “Nashville Cats” of the 1960s and ’70s who are the focus of the exhibit — has attracted rock, folk and pop musicians to record there as well.