Sure, I know "You've Got Another Thing Comin'" and "Breaking The Law" and "Living After Midnight," and I recognize the cover for their album British Steel - iconic. But I don't have the long listening history to differentiate the Priest in any meaningful way from, say, Iron Maiden. I mean, of course there's nobody who sings like Rob Halford, but I don't know what the central themes of their music are.
Stained Class is Judas Priest's fourth album, released in early 1978. So, while one subculture was being fed from Talking Heads 77, another was reaching out for Stained Class. Wikipedia says that before this record, the Priest played more prog-rock and this and subsequent albums were more heavy metal rock and roll.
So, let's club Stained Class, shall we?