There is more than one artist with this name: 1) Petra is a Christian Rock band formed in 1972 by Bob Hartman, Bill Glover, John DeGroff, and Greg Hough. "Petra" means "rock" in NT Greek, making the band name a triple pun. Rising from the jesus music movement, and initially signed to Myrrh Records, they fought to gain acceptance and recognition in a church culture that at the time believed rock music to be off-limits.

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