I had exactly same problem here... it goes since 1996. I've written the music all over the notes. I even played 'em all. The rhytm, drums, piano, bass, guitar, keyboards, etc. (It was the days of Cakewalk Pro 4...) I even record it in my own studio. My indie label, and I'm the producer here. BUT... my very close friend helped me wrote the lyric because he got some good story to be put there. Yeah, I must admit it was good story. So we made it. The guitar line was the MOST BEAUTIFULLEST guitar interlude I've ever played. IMHO, like the one Slash did on "November Rain". The reason I produced the song is because the guitar line is so amazing. Every my friends told me so. Then, in couple weeks, my friend here claimed that he got the copyright for the song. WHAT...? I wasn't into copyright things before, so I never care untill he claimed for the royalties. No, it wasn't that much he wanted, just a few percent of the total profit. But, knowing that even my best friends crossing me step ahead is anoying me.
My friend here, he died last monday. I'm very sorry for that. And his family gave all the "musical things" he got to me. His Bass guitar, his working sheet of poet, even his home tape recording. Also the copyright sheet. I have it all now. I never asked, but nobody in his family knows what to do with those, that's why they gave to me. The lesson he gave to me is I must realize that music business needs more attention when you get to the industry... You never realize the pursuit of what you had untill you loose it... Thank's my friend, may God puts you in peace...