Unfairly looked over as a potential single from her most recent album Femme Fatale, this album track is one of the more aggressive songs in the Spears catalogue. Riding along the dubstep wave that has since infected virtually every other pop artist, Inside Out is a gritty breakup song that gives Britney the chance to name check her biggest hits (hit me one more timeyoure the only one who ever drove me crazy, she sings). By now, shes earned it.