Ever since the early days of the Louvin Brothers and the Everly Brothers, duos have played a big role in country music. In fact, some of the most successful, influential acts in country music history have been duos.

But which duo is the best of the best? Do you prefer the old-school country style of groups such as the Judds? Maybe you like rowdy, rockin' country, such as the music of Montgomery Gentry? Or do you go for the crossover sounds of contemporary groups such as Sugarland and Florida Georgia Line?

Whoever your favorite duo is, you can vote in the poll below as often as once per hour. And if you don't see your pick among the options, let us know in the comments section!