This article by Philip Cooney is well worth reading. If you have heard of Larry Norman, you have just confirmed my suspicions: you are a fellow oldie! If you haven't, reading Phil's article will whet your appetite for listening to his great songs, I hope.
I got my first Larry Norman LP on loan from Maxine McKew's second cousin, Laura, who was one of my guitar students in Brisbane. [Yes, I know I can hardly play the guitar, but I got away with it for a few years while eking out an existence at Kenmore Christian College i the late 70s.]
The remastered version of the LP is fabulous and includes quite a few extra tracks, all interesting.
Phil's article is in the online version of The Briefing called The Longing.