"Teen Spirit" comes on like a very now movie about pop music and those who inject it like an adrenalized sugar-high dream. (I'm one of them.) Violet (Elle Fanning), a 17-year-old British girl who lives with her Polish immigrant mother (Agnieszka Grochowska) on a farm on the Isle of Wight, is in thrall to the incandescent rush of pop. She plugs into it on her iPod, she sings it with piano accompaniment at a dingy local tavern, and when officials from an "American Idol"-style competition show called "Teen Spirit" turn up on the Isle looking for contestants, Violet signs right up. She wants fame, rapture, a chance to be rescued from the flat dull anonymity of her normalcy. The movie is a Cinderella fantasy for the age of aspirational global stardom, and it features a soundtrack of ecstatic up-to-the-minute EDM, though it also finds room for such delectable chestnuts as Ellie Goulding 's "Lights" and even "Flashdance … What a Feeling."