Diffuser is a rock band from Long Island, NY that formed in 1994 by Tomas Costanza (guitar/vocals), Anthony Cangelosi (guitar), Lawrence Sullivan (bass) and Billy Alemaghides (drums). Originally the band was called Flu 13 and released a 7-inch entitled Edgar's Airwaves and an album entitled Spin Cycle before being signed to The Medicine Label. After being signed they released their second album titled In The Foul Key Of V.

The band signed with major label Hollywood Records in 2001 and changed their name to Diffuser. In 2001 the band released their first album on Hollywood Records titled Injury Loves Melody. Their single "Karma" was included on the Mission: Impossible II Soundtrack; it peaked at number 20 on the Billboard Mainstream Rock Tracks chart and No. 26 on the Modern Rock Tracks chart.