The good news is....
It's totally fixable to where I can totally remove it to where you can't even notice it was ever there.
The bad news is, I'd have to literally treat every section individually using a tool that can't be used "on the whole file". It would probably take me 4 hours or more to do a 7 minute tune like this. LOL! And of course, I wouldn't even charge a client nor would I take on the job unless someone was stuck with this as a song that was theirs. Hahaha!
The semi-good news is....I was able to come up with a tool that with some experimenting, could be used on the entire song. I'd say it's a 90% improvement to where you can barely tell anything is going on. The artifact that you will hear is it took a few of the clicks/crackles and somewhat toned them down to where the high end isn't as apparent and it almost sounds like a soft driven type of thing. You'll hear what I mean....it's WAY better than it was though...and this only took about 20 minutes which is better than 4 + hours that I wouldn't have done anyway! LOL!!!!
I also took the level down a bit for you because it was clipping like mad on my end. So this should get you where you need to be as far as a guitar backer goes. Uggh...why did they choose Bb! We as rock guitar players don't play in Bb!
OK at least *I* haven't had to play in that key much. Hahaha! It seems Eb/D#, F, G#/Ab are the keys I've played in the least in my years playing. When I HAVE had to play in those keys, it was because someone was tuned down or something. However, thankfully I've been playing in all keys my whole life just in case....but when those pop up, it takes me a few seconds to remember where I am! LOL!
Anyway, let me know how this worked out for you. Merry Christmas to you and everyone else on the forum.
-Danny