Get ready for a Showdown between two of the most powerful female vocalists in country music. Carrie Underwood and Jennifer Nettles will go head-to-head today and over the weekend.

Underwood's new single, "Heartbeat," is very personal to her. The superstar says she was thinking about her husband when she recorded the track, which is the latest single from her new album, Storyteller.

Nettles is returning to one of her strongest suits with "Unlove You," an emotional new ballad that's the first we've heard of her upcoming second solo album. The Sugarland singer is going less experimental with the new track, giving Sugarland fans more of the style they have come to expect from her and offering up a tremendously satisfying performance in the process.

Two great singers, two great songs — but only one can move on to another Showdown round. Listen to clips of both Underwood and Nettles' songs and vote for your favorite here. You can vote once every hour until this Showdown ends on Monday at 8AM ET, so come back and vote often to be sure your artist wins. The winner of this matchup will face a new challenger on Monday.

Listen to Carrie Underwood, “Heartbeat”

Listen to Jennifer Nettles, “Unlove You”

Showdown Rules: The song with the most votes wins, and the winner goes on to face a new challenger in the next Showdown. Vote as much as once per hour online. If a song wins five Showdowns in a row, it will be retired into the Taste of Country Showdown Hall of Fame to allow for new songs to compete. Some songs will be considered for a second Showdown if voter turnout is healthy in a losing effort.