> Is what I've described a normal and ethical procedure in the industry? <
No.

Besides, there is a formal flaw in X's reasoning. I assume that you wrote the words, your partner did the music. In this case your partner must agree to have the melody altered. He then is still entitled to a share as co-composer of the song (actually Mr. X would function as an arranger - but, depending on the contract that is agreed on, he might also become a co-composer). Nothing to do with your share as a lyricist.

Fees and royalties for producers and musicians are a different piece of cake altogether. Also, it's not the creators who are supposed to pay any fees but the musicians or their label.

Have fun,
Bernd

Bernd
[url]http://bernd-harmsen.com[/url]