In the past I collaborated on making an instrumental with another person. This was a sample-based instrumental that I have not attained clearance for. I created a beat and the other person basically just slowed it down and changed the drums. He had one of his friends record on it and it turned out great. However, my name isn't credited anywhere whatsoever, and my audio voiceover with my name (JayP) was removed but the other person's is on it. I want to know what rights I have to that instrumental in case there is any money made from albums or singles sold.