Okay, random question because I don't like starting a completely new thread:
Assume I started a collab with an other musician/producer. We had a wonderful candle-lit dinner by the sea, and made a song. At some point in the future, I decided to make an album, which includes the song I collaborated with the other guy and put it up on Bandcamp (or some other music selling site). If I made a considerable amount of profit from the album, is the other musician entitled a part (which is agreed on) of the profits?
How about a different situation? A remix, instead. Being a capitalist and all, I released an album which contains a remix of a song by another musician/producer. I have permission by the original musician/producer. Is he entitled to the same thing I just mentioned in the previous situation?
P.S. I'm not actually doing/intending to do this kinda thing, but the thought just kinda came to my head.