So this is gonna sound weird, and maybe a little off topic, but if anyone has ever had this happen to them, it's hard to just let it go. I got the memory of a song stuck in my head, and it won't be satisfied til I hear it again.
How this relates to Halo is that it was a fan made song called Cortana...I don't remember if they were an all Halo band, or just video game related. It was a slow song, and the band may have not been super talented, but I remember Cortana being their one really good one.
This had to have been years ago, either during the release of Halo 2 or 3 when I first heard this. I've tried searching on youtube, and google, but because I don't have much to go off, I can't find it. Maybe if someone has an idea of what I'm talking about, they can point me in the right direction please?
EDIT: Found it! Yep, it's super cheesy, but I kinda like it. heh