I know someone who did a translation for a game, a "doujin" Japanese visual novel. He got in touch with the author in order to license the game, and that went well. He then considered doing another game by the same author.

Problem for the next game was the music. The original author commissioned about a dozen of artists, problem is, he didn't own the rights, only a licence for having the music in the original game. So the translator had to find a way to get in touch with all of the rights-holders and negotiate a license for the translation with each one. Because he is just one man, it was simply too much work and he abandoned the project.

It is actually a rather common situation. It may result in cancelled projects, changing the music with a varying level of success or just removing it altogether.