"Firework" was inspired by a passage in the book On the Road by Jack Kerouac in which the author compares people who are full of life to fireworks that shoot across the sky and make people watch in awe.
"Firework" byl inspirován pasáží v knize "On the Road" Jackem Kerouacem, ve kterém autor porovnává lidi, kteří jsou plný života, ohňostrojem, který střílí oblohu a dělá lidi s úžasem.