“Charlie Louvin has been singing about the extremes of country music-- salvation and damnation-- throughout his long life. He and his brother Ira began harmonizing at home as kids in the 1930s and playing their first public shows as teenagers in the early 1940s. During the 1950s and 60s, they had hits with secular and nonsecular songs alike, which cemented their legacy as one of country's most conf”