Yeah I made a loyalist version of Chaos Noise Marines. I've always entertained at the thought and well always wondered why there was never one.
Anyway Steel Crusaders have uncovered lost tech and parts of ancient Terra. One such is the music lost from the time. The time called it Heavy Metal, but use it as battle hymns and inspiration and weapons for their troops and against their enemies. Weapons fashioned from Bass and Electric Guitars are used as offensive tools of destruction and stationary drum kits are used as defensive shielding tools. Thrash Marine squads and called "bands" with Sevitors "Roadies" serving as the maintenance and security crews. Bands fashion their armor after the "Gods of Metal", such as the Band called La Grange with Veteran Sergeant "Dusty" Gibbons.
Stand helmets are fashioned into the Iron Stare (lol get it?)
If you're not familiar with the band ZZ Top, I named the Veteran Sergeant after the Basist and Guitarist from the band and the squad from one of their hits.