Field Green Apps is offering the Mix Me In2 Taylor Swift iPhone app free to the first 10,000 people who download the game, which lists for $2.99. The company also has a “Your Song” contest, which allows fans to upload their remixed Swift songs to TaylorMix.com for a chance to win an autographed guitar. Swift will determine the winner. The program allows fans to mix themselves into “Love Story” and “You Belong With Me” by replacing existing instruments and vocals to make them new tracks. Details here.