After two months of stability in the winner's circle, champions can't stay seated in recent days. Yesterday and last night on Taste of Country Nights radio, Carrie Underwood's new single surplanted Lee Brice's 'I Drive Your Truck' after just on night on top. Prior to this week, seven consecutive winners have moved on to the Hall of Fame. Can Underwood's 'Two Black Cadillacs' become the next?

To win five in a row, her song will have to top 'The Only Way I Know' by Jason Aldean and friends. The singer performed this hit song at the ACAs last night (Dec. 10), and in fact both artists were on hand to collect awards. It's a true battle of superstars on Tuesday.

Listen to clips of both Underwood's and Aldean's songs and vote for your favorite here. You can vote once every hour online, so come back and vote often to be sure your artist wins. Hear the full versions of the songs tonight after 10PM on Taste of Country Nights. Help your favorite song win by placing additional votes at (888) 678-9995. Call as many times as you like! You can listen to the show online through any of the 41 radio stations that carry it. Voting will end tonight at 10:40PM CT.

Listen to a Sample of Carrie Underwood, 'Two Black Cadillacs'

Listen to a Sample of Jason Aldean, 'The Only Way I Know'

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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, and as much as you want by calling (888) 678-9995. If a song wins five days 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.