One thing you said in your intro bothers me too... You 'paid' for this? Please don't be offended but I'd really like to know, did I understand that correctly? You handed over money?
LOL.... I sort of "handed over money." The musician was a friend of a friend. He needed a place to stay. I was working out of town, and had struggled to find people to live in my house while I was gone --- I'd make it home one weekend out of every six weeks, and was worried about leaving the house empty.
I let him live there if he would pay the utilities. He had no money (standard starving musician) so I traded him for music. He would write melodies and basic accompaniments to my lyrics for $50.00 per song.
What makes your incredulity even more funny (well, it's funny NOW) is that after being "paid" to write the music, he felt that he still should own half the song. Wasn't really very funny at the time.
On the other hand, I have over fifty songs (including some of my best ideas) from collaborations with him.
And, the stuff he did with me is (according to everyone who listens but HIM,) the best stuff he's done in his life.