Firework is a song by Glee Cast from the album Glee: The Music Volume 2. It was released on 2011 and was originally written by ESTHER DEAN, SANDY JULIEN WILHELM, KATY PERRY, MIKKEL STORLEER ERIKSEN, TOR ERIK HERMANSEN. Musically, the song is a Dance track and it has a tempo of 124 beats per minute.