The 'Hammer Song' is the final song at the end of the first act of The Barber of Seville (1816), the most famous opera by the Italian composer Gioachino Rossini. In the scene, police arrive at Doctor Bartolo's house to arrest Count Almaviva, who is disguised as 'Lindoro' – but they release him when he reveals his true identity.

All of the opera's characters are on stage, and everyone is confused about why 'Lindoro' has been let go. The atmosphere is very tense, as Doctor Bartolo is angry and Almaviva wants to save Rosina (Doctor Bartolo's adopted daughter). The 'Hammer Song' expresses everyone's emotions as they feel like they are going crazy!