Tim, if you've copyrighted the songs, and your name/publishing company appears on the CD, then - in theory - you're entitled to some cash back from the CD sales.

If you've let the performer use it for their CD - then it's a gentleman's agreement as to what you gain from it.

In future, if you feel you want some remuneration, then copyright the material and assign it to a publishing company (Your own will do). When future CDs appear with your material on it, then you'll be entitled to a share of the sales. It's all down to what you really want.