There are 2 bands with the name Defiance: (1) Defiance is a thrash metal band from Oakland, California. While virtually unknown to mainstream metal and rock circles, Defiance is known as one of the classic second-tier thrash bands to come from the Bay Area thrash metal scene. They played a decidedly technical style of thrash originally evoking bands like Testament, though they would later move on to playing in their own unique, more progressive thrash style. They reformed in 2005 and have since release an album entitled The Prophecy in late 2009.
Poison Idea was formed in 1980 in Portland, OR by vocalist Jerry A. (aka Jerry Lang). The initial lineup consisted of Jerry A., Tom “Pig Champion” Roberts (guitar), Glen Estes (bass), and Dean Johnson (drums). Inspired by Black Flag and other early Southern California hardcore acts, they were further influenced by Discharge and Los Angeles's the Germs. Germs singer Darby Crash was a strong influence on singer Jerry A.—vocally, lyrically, and philosophically—was monumental, and Poison Idea followed the Germs’ extremist punk ethic.