Rockin' in the Free World

Howdy folks!

I’m trying to learn Rockin’ in the Free World by Neil Young. It’s in Em and I’m wondering if anyone else out there has played it. I’m not really looking to solo, just add to the hard-driving rhythm of the song. For Em, that leaves me with an A harp (2nd position) or a Natural Minor Em (e.g., from Lee Oskar).

I’ve tried both and I’m having trouble finding a good groove.

Has anyone played this song or do you have any recommendations on how to approach it, especially with regard to harp choice?

Any advice is appreciated!!
Eric