Premise: Stryper is an American Christian metal band from Orange County, California. The group's lineup consists of Michael Sweet (lead vocals, guitar), Oz Fox (guitar), Tim Gaines (bass guitar), and Robert Sweet (drums). In 2004, Gaines left the band and was replaced by Tracy Ferrie (bass guitar) but rejoined in 2009, only to be fired after tension between the band, Gaines and his new wife.
Hypothesis: Stryper is has gone through member changes