No kidding, I really have. That's a great guitar tune. It's pretty catchy, and it's actually begun to worm its way into my brain lately, so much so that I catch myself at times thinking, Hey, I'm humming an anime theme song! And I kinda like it.
Thanks, Alan, for exposing this to me. I've never been a big fan of anime (unless you count the 1980s Thundercats), but I'm starting to get a little interested in the universe surrounding the planet Gunsmoke. Maybe I'll check out an episode or two.