This Max Martin and Shellback penned up-tempo number features a Euro-pop whistle motif. The song was one of seven that co-executive producer Max Martin contributed to Femme Fatale
and his relationship with Spears goes way back to her debut single, "…Baby One More Time
," which he wrote. Spears told Rolling Stone
why the Swedish hitmaker gets the best out of her: "Max played a huge role on this album and he has been there since the beginning so there is such a huge level of trust. He gets exactly what I am saying when I tell him what I want and don't want musically. His melodies are incredible and he is always coming up with weird sounds, which I love. The whistle on 'I Wanna Go' still gets me every time I hear it. Who would have thought of that? There is nobody I feel more comfortable collaborating with in the studio."