Pop Idol: The Big Band Album is released on Monday and is packed full of tunes sung by the final 10 favourites.
Winner Will Young, who's already topped the charts, gets two songs on the CD, Beyond The Sea and I Won't Dance.
And Gareth, who's currently number one with his version of Unchained Melody, sings Mack The Knife. But he also gets to duet with his best Pop Idol pal, Zoe.
There's 13 tracks altogether on the CD, and music bosses expect it to be massive.
Hundreds of thousands of fans have already bought Pop Idol singles and raced to buy tickets for the sold-out tour.