Joshua Coleman, better known as Ammo, is an American musician, songwriter, and record producer. In November 2008, Ammo was signed to producer Dr. Luke's publishing company Prescription Songs as an exclusive producer and songwriter. Ammo has gone on to write and produce songs for Ke$ha, Pitbull, Jesse McCartney, Jordin Sparks, and Britney Spears.

Work with Katy Perry

He worked with Katy Perry on the following songs:

Songs from Teenage Dream (2010):