The only thing better than a great singer is when two singers combine their talents, especially in country music. These are ...

A good song becomes a great song when Dolly Parton joins Zac Brown Band's "Butterfly." Seriously though, how often has that been the case? The country legend seems to be amid a collaboration era.

When two powerful singers come together to tell a story, it makes the message that much more compelling. In the case of these 23 sad country duets, that means that the heartbreak feels ... well, twice ...

Before there was George and Tammy, George Jones and Melba Montgomery were climbing to the Top 10 in the early 1960s.