Help ID this song, please!
 

I'm trying to find the name of a reverbalicious, western sounding instrumental song. It sounds like the opening chords are strummed iii-iii-I, with a few repeats, very slow, with a strong slow drum beat. I've heard it in commercials before, usually accompanying a slow motion, the Right Stuff, type walking.

Anyone have ANY clue of what I'm talking about? Thanks!

Got it.. Rumble by Link Wray :)