Spears' splashiest recent singles — “Til the World Ends,” “I Wanna Go” and the Will.i.am collaboration “Scream & Shout” — have all been overpowering electro-shocks unleashed on the dancefloor, with her voice mutating into mythic shapes over planet-size beats. Her newest (produced by Dr. Luke, Ammo and Cirkut) is another big Euro-house escapade (complete with a stomping bit before the chorus where she and a cheerleader army of micro-Brits promise to “turn it up till the speakers pop”). But the song, cut for the soundtrack to The Smurfs 2, is mainly noteworthy for how airy and open it feels; Spears’ voice during the verses is lithe and uncluttered, the melody is carried by a breezy acoustic guitar and the chorus (“come with me be my ooh la la”) is one of her gentlest bubblegum innuendos. If the gear-shifting structure assures the song never quite hits lift-off, being underpowered is okay. This is Britney as summer breeze, blowing through the wind tunnel of our mind.