Tonight, Scotty McCreery and Lauren Alaina will compete for the final time as they attempt to win Season 10 of 'American Idol,' and among their song performances will be tunes picked out for them by their respective musical idols, George Strait and Carrie Underwood.

USA Today reports that each performer will sing three songs. One will be the artist's debut original song, one will be their favorite song they performed during the season, and one will be the hand-picked track selected by the celebrity guest.

McCreery, the 17-year-old aspiring country singer from North Carolina, will perform Strait's yet-to-be-revealed song choice, as well as an original called 'Love You This Big,' as reported by Taste of Country.

Alania, the 16-year-old from Georgia, will perform an original called 'Like My Mother Does,' as well as whatever Season 4 'Idol' champ Underwood chooses for her.

Tonight's performances will be available for purchase via iTunes after the broadcast on FOX. Their new singles will be released to radio on Thursday.

Watch Scotty McCreery and Lauren Alaina Perform 'I Told You So' on 'American Idol'