"Firework" is a song performed by Katy Perry, written by Perry along with Ester Dean and Stargate. It was released in 2010 as part of her album "Teenage Dream." The song is in the key of Ab major and falls under the pop genre. "Firework" refers to self-empowerment and acceptance, encouraging listeners to embrace their uniqueness and shine bright like fireworks. It has become one of Perry's signature songs, achieving commercial success worldwide. The composition features powerful vocals and an uplifting melody that showcases Perry's vocal range and dynamic performance style.