I'm currently elaborating my class plan for a presentation about the history of US cinema. We generally resort on some interesting elements, like a piece of music, an image or a poem to start the presentation and to make our students feel motivated for the class. I was thinking about incorporating an excerpt of a metal song that featured a characteristic cinematic, bombastic and Western movie-like type of aesthetic, in their sound and image, as I'll be talking about US Western movies in the presentation, as well.
I've initially thought about Orden Ogan's song "Gunman", as the music and the video fit the theme and what I'm looking for. However, I'm not quite sure if their story for that song is actually about that. I guess I need some help on that.

Before commenting, please, take into account the topics below:
*It must not be extreme metal or anything else, too fast or aggressive, evidently; preferably, symphonic or power metal;
*It has to feature an official video for that same song, which thematics have to be related to Western movies lifestyle and aesthetics.

Thanks in advance!

The story behind Gunmen seems pretty standard western-y plot wise (if you discount the bit about the vampire and whatnot). Unjust death, love, redemption, vengeance etc...

Another totally Western themed song off the top of my head is Manowar's "Outlaw." Not sure if there's a good video for it though.

Someone made an incredible video for W.A.S.P.'s track "Widowmaker" that could fit the bill. Here it is:

https://www.youtube.com/watch?v=CprjKrgvAYk&t=130s

Speaking of that band, "Blind In Texas" is pretty fun. Depending on how you view them, Ratt's "Wanted Man" and accompanying vid also works.

Wayfarer?

Leverage's "Red Moon Over Sonora" is super Wild West influenced, and, while it only has a lyric video, the visuals are very appropriately themed.

First thing I thought of, apart from the Gamma Ray song, is Ghoultown. The band of Count Lyle of Solitude Aeturnus, when he left. More rock than metal but it's great stuff. And lots of it.
Ghoultown - Drink with the Living Dead

Gamma Ray - Lonesome Stranger

Not the most relevant but necessary nevertheless.
Metallica - Ecstasy of Gold/Blackened (live Nimes)

[url=https://www.youtube.com/watch?v=8_ZKS4JlJSg]Desperados - The Dawn of Dying
Tom Angelripper's "western metal" debut.

Jeff Walker's album of country covers: Welcome to Carcass Cuntry

Rebel Meets Rebel The Pantera with David Allan Coe on vocals album.

Volbeat has plenty of that too. Some metal, some hard rock, some pop punk, some a mix of all that. Anyway, I like them:
7 Shots
Doc Holiday
Hangman's Bodycount
Black Bart

Poppier but good.
I'm So Lonesome I could Cry (Hank Williams cover)
Lonesome Rider

In the Sabaton-ish, symphonic power realm, this dude did that piratey/western folk themed album:
Antti Martikainen - Wild Iron
Saloon Showdown