Prevent Google Music (but not other players!) from scanning local files I'm wondering if there exist other options rather than adding  the '.nomedia' file - this way I'm hiding the mp3s for all the players I have. But I want just Google Music not to see them, not other ones.

BTW, placing a dot in the beginning of the folder name hides the files in all the players as well.
Well, if you are on android 6 and above, you can just revoke "Storage Permission" of the application.