"I guess you can make the argument that coding up the solution that does the generating of the music is the creative part here" They unambiguously have a copyr

"I guess you can make the argument that coding up the solution that does the generating of the music is the creative part here" They unambiguously have a copyright to whatever software they wrote to create this output. You do not in general get copyright to the output of software, though. (You may in specific. I'm not getting too detailed here. But you definitely do not in general.)