Trent Harmon's mighty voting block seems like it can overwhelm anything or anyone. The same enthusiastic voters who helped him win the final season of American Idol have given him another massive Showdown win, this time against Steven Tyler. He'll go on to face a new challenge from Jamie Lynn Spears.

Harmon's new single, "There's a Girl," is a sweet country ballad, very different from the too-hot-for-radio "Falling." So far his fans have voted very, very decisively for it to continue in the Showdown.

But don't count Spears out yet. She made great inroads in country music with her debut single, "How Could I Want More," and she's got an extremely passionate and motivated fan base of her own. We're about to find out if they'll turn out for her new single, "Sleepover," a flirty but earnest song in which she makes it clear she's looking for no games from a man.

Listen to clips of both Harmon’s and Spears' songs and vote for your favorite here. You can vote once every hour until this Showdown ends on Friday 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 Friday.

Listen to Trent Harmon, “There’s a Girl”

Listen to Jamie Lynn Spears, "Sleepover"

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.