Try some Dream Theater.
Metal
Metal community, all subgenres welcome.
It only seemed fitting to have Lemmy himself as the icon.
Other Communities:
I've never been all that big on A7, but Nightwish leaned hard into theatrical/movie score territory for a few albums. Some notables:
Dark Chest of Wonders
The Poet and the Pendulum
Elan
Ghost Love Score
One more: Last Ride of the Day
Never dug anything A7X but as you describe this "theatrical" metal (or at least what I can understand) I only can think of Ayreon.
Ayreon is so damn theatrical that they made and filmed an opera called "The Theater Equation" and it's pretty damn glorious. Check out Dream Theater's "The Astonishing" if you want to hear a more dramatic story as well. If you want something more symphonic with mostly traditional orchestral instruments, Blind Guardian's "Twilight Orchestra - Legacy of the Badlands" will scratch that itch. Shadow Gallery, Symphony X, and Threshold are also honorable mentions.
Another great thing about Ayreon are his guests singers and musicians from the whole industry
Blind Guardian comes to mind when i think theatrical
"And then there was silence" alone is 🤯 especially if you know the Iliad it just goes so incredibly hard.
Igorrr is the first that comes to mind. Bullet for My Valentine is the same era so you probably already know them, but they're who came to mind next.
Ice Nine Kills?
Theatrical as in Movie Theater though
My first thought was of GWAR, but it's not really the musical style. It's the fact they are a metal band and put on a lot of theatrics in their shows (costumes, skits, etc). I'm not even that big of a metal fan, but I've always wanted to go see GWAR after seeing some clips of their live performances.
But yeah, the style you seem to be looking for is, as I've always known it, called progressive metal.
Notre Dame and Therion ?
'Theatrical' makes me think of Avantasia, though I've never thought of them having much to do with A7X until now. My favorite album of theirs is The Scarecrow.