What's the first modern metal album?

Newly disciplined research reveals that metal was actually not invented until Queensrÿche's Rage for Order.

The more I listen and read about metal, the more it seems like it took punk to make metal what we think of today. Most people seem to agree that Black Sabbath was the first true metal band, as far as heaviness. However, when I think about "modern" metal, I think about bands like Motorhead and Venom (and other NWOBHM acts) taking cues from punk, regarding intensity, speed, vocal style, and pushing the envelope of what was acceptable to rock-learned ears.

There's certainly a strong case for metal not really existing until 1979! Judas Priest kind of held the fort all by their lonesome for a few years.

Has anyone read this? There doesn't really seem to be a widely published, well written Priest book.

Judas Priest: The Early Years (1983)
http://www.amazon.com/Judas-Priest-Early-Years/dp/B000KY3YGI/ref=sr_1_7?s=books&ie=UTF8&qid=1442353790&sr=1-7&keywords=judas+priest

And yeah, along with Motorhead, lots of hard rock influenced metal - Scorpions, AC/DC, UFO, Thin Lizzy, Van Halen, etc.

This might be promising:

Neil Daniels - The Story Of Judas Priest - Defenders Of The Faith (2010)
http://www.amazon.com/Story-Judas-Priest-Defenders-Faith-ebook/dp/B003FV7G4E/ref=sr_1_10?s=books&ie=UTF8&qid=1442354906&sr=1-10&keywords=judas+priest

The Birth Of Metal

Was heavy metal invented by a single band? Was it dreamed up by a journalist? Was it born on a particular album, perhaps premature and deformed, denied by its parents and returned to live in an orphanage until it was adopted years later by a DJ, a journalist, a bunch of younger bands and some headbangers? ...

http://fastnbulbous.com/wp-content/uploads/2015/09/blacksabbath-born-again.jpg

This is a really cool thread, like what is the Big Bang of metal or whatever… leaning towards sad wings right now because I’m uhhh listening to an og pressing* right now and:

1) the ripper, cmon, especially the beginning
2) dreamer, deceiver is so… lighters up

*sold the bullshit promo I had that had all these lame radio-friendly edits like omitting the fade in to “victim of changes”

oh also, rob goddam vocals trills holy shit