"Shattered Glass" is an uptempo pop song with guitar riffs, jagged and distorted vocals in the verses, and a melodic chorus.Spears' "robotic electro-sound", Auto-Tuned vocals on the track have drawn comparisons to her 2007 album "Blackout", though it has been noted by ABC News' Allan Raible that her vocals sound more "alive" than on the rest of "Circus".