THE ChristianRock band. Not technically the first, but the first to have a major impact on the culture. Formed in 1972 by Bob Hartman (who had himself just become a Christian at the time) and some friends of his from college, but best known for their work during TheEighties. Appropriately enough, their name is simply Greek for "rock".

The band underwent many, ''many'' changes in both its lineup and its sound over the years, but its most well-known lineups -- and the only ones that lasted for more than two albums -- were Bob Hartman (guitars), Greg X. Volz (vocals), John Slick (keyboards), Louie Weaver (drums), and Mark Kelly (bass); and Bob Hartman, John Schlitt (vocals), John Lawry (keyboards), Louie Weaver, and Ronnie Cates (bass). These changes, mainly responding to the changing face of contemporary rock, were mostly welcomed, at least until TheNineties when they moved toward a more AlternativeRock sound, which left fans... [[TheyChangedItNowItSucks disappointed]]. They returned to a hard rock sound in 2003, before finally disbanding.

In 2010, their 1985 lineup reunited for a tour as Classic Petra and a studio album released in 2011.

Being the first major band to introduce rock music to a culture known for being largely hostile to it, they were no strangers to controversy, including the predictable accusations from MoralGuardians that they were hiding Satanic messages in their songs. They fired right back in 1982 with a prominent back-masked message at the start of the song "Judas' Kiss" (when played backwards, the message says, "What are you looking for the devil for when you ought to be looking for the Lord?"), and in 1985 with the bitingly satirical "Witch Hunt", which accuses their critics of caring more about stamping out things they are suspicious of than actually spreading the Gospel. Eventually they outlived the criticism and went on to win many awards, including four Grammys for Best Rock Gospel Album.

Discography (not counting concert albums or the many, ''many'' compilation albums released over the years, mainly by their former labels):

* ''Petra'' (1974)
* ''Come and Join Us'' (1977)
* ''Washes Whiter Than'' (1979)
* ''Never Say Die'' (1981)
* ''More Power to Ya'' (1982)
* ''Not of This World'' (1983)
* ''Beat the System'' (1985)
* ''Back to the Street'' (1986)
* ''This Means War!'' (1987)
* ''On Fire'' (1988)
* ''Petra Praise: the Rock Cries Out'' (1989)
* ''Beyond Belief'' (1990)
* ''Unseen Power'' (1991)
* ''Wake Up Call'' (1993)
* ''No Doubt'' (1995)
* ''Petra Praise II: We Need Jesus'' (1997)
* ''God Fixation'' (1998)
* ''Double Take'' (2000)
* ''Revival'' (2001)
* ''Jekyll & Hyde'' (2003)
* ''Back to the Rock'' (2010, as Classic Petra)

!!Petra provides examples of:
* AlbumTitleDrop: ''On Fire'' (shouted in the song "Hit You Where You Live"), ''Unseen Power'' (a short spoken track at the end), and ''Wake-Up Call'' (a line from "Sleeping Giant")
* AsTheGoodBookSays: Nearly every song contains some paraphrase of a Bible passage. And in case anyone doesn't get the reference, the reference was always printed above the lyrics in the liner notes. In one instance, lack of familiarity with [[ Romans 6:6 in the King James Version specifically]] made it impossible to understand that the song is [[JustForFun/IThoughtItMeant not about a man killing his father]]. Never ones to shy away from controversy, these guys.
* {{Awesome McCoolname}}: Greg X. Volz (one cash-in compilation by their previous label miswrote it as "Grex X. Volz", which is arguably even cooler). Also, keyboardist John M. Slick.
* BookEnds: "Visions" from ''Not of This World'', and to a lesser extent the untitled instrumentals that opened and closed ''Unseen Power''.
* ChristianRock: One of the first rock bands to have a major impact on the Christian music culture.
* TheCoverChangesTheMeaning: Their two(!) covers of "God Gave Rock and Roll to You" would probably count from the chorus alone, considering the source, but then we get retooled lyrics like
-->You can love the Rock, and let Him free your soul\\
Or you can let the Old Man[[note]]Yet another reference to Romans 6:6[[/note]] take his toll\\
It's never too late to change your mind
* HopeSpot: ''Jekyll & Hyde'' was their hardest album since 1990 at least, and highly acclaimed... but it was also their last.
* IAmTheBand: Bob Hartman is the only member of the band that stayed in the band during the entire run.
** Hartman retired from touring with Petra in 1995 and was no longer the face on the album cover, but he was still Petra's principle songwriter and in-studio guitarist. He returned to being a full-time touring member in 2001 with the release of ''Revival''.
* JustForPun: Quite a few titles, most of which are only puns in the context of the lyrics. "Altar Ego", "Killing My Old Man", "King's Ransom", "Dead Reckoning", "Midnight Oil", "Believer in Deed", and "Sincerely Yours".
** Also, their ''name''.
* LongRunner: Thirty-four years officially, not counting various reunion tours.
* LighterAndSofter: ''Washes Whiter Than'', "The Coloring Song" from ''Never Say Die'', and pretty much everything from 1991 to 2000.
* NewSoundAlbum: It'd be easier to list the albums that ''don't'' count. So here they are: [[{{Beat}} ......]] Did I go too fast for you?
* NonAppearingTitle: "The Coloring Song"
* PowerBallad
* RevolvingDoorBand
* RuleOfCool: The '80s album covers, particularly those featuring the "Guitarships".
* StepUpToTheMicrophone: Bassist Mark Kelly shared lead vocals with Greg Volz on "I Can Be Friends With You" and "Disciple". Producer John Elefante (Kansas) and Lou Gramm (Foreigner) shared vocals with John Schlitt on "We Need Jesus". And the mostly-unplugged-rerecordings album ''Double Take'' featured guitarist Pete Orta performing his own composition, "Breathe In".
* SubliminalSeduction: Parodied twice: ''More Power to Ya'' featured a conspicuous backwards message between two tracks -- "What are ya lookin' for the Devil for, when ya oughtta be lookin' for the Lord?" -- and "Witch Hunt", a song directed towards the accusers, whose bridge included backmasked lines that turned out to just be the spoken lines from the film ''Film/TheWizardOfOz''.
* TakeThat: They had several songs that were critical of contemporary Christian culture, such as "Rose Colored Stained Glass Windows" and the aforementioned "Witch Hunt," which doubles as a TakeThatCritics of sorts (and a rare [[JustifiedTrope justified]] example).
* TheSomethingSong: "The Coloring Song"
* VisualPun: The cover of ''Unseen Power'', a photo of turbine windmills.