Electric guitar...

I'm tellin' ya....

That whole JP "British Steel" album is a GREAT lesson in timing and the basics of song structure.

IMO, you could remove "Breaking The Law" and "Living After Midnight" and it would still be a GREAT album.

Also interestingly-

That riff to 7 Nation Army.....I came up with on my own around 1986.
It's a fairly natural progression for someone to try that's starting to get a feel for the spacing of chords that work or kind of work together. At the time I rejected it as a riff to build a song around because I thought it was too simplistic and borderline not sonically pleasing enough.

The first time I heard that on the radio, I 'bout ****, though.

I was also working with a riiff back then that was incredibly similar if not identical to Volbeat's "Warrior". That one I developed and had about 2/3 of a song built around it.

When I first heard Volbeat I immediately liked it, but it took until I tried to play it for me to realize why.....because I F'n wrote it...

That's a very odd feeling.