what should we do if we want to borrow the mp3 file from another person's map? i know that people like giving credit when they do that but wouldn't we ask the original mapper if we could use their mp3 file?
Most people don't even bother asking and just take it. If you want to be a good boy, you can ask it, but since there isn't any rule about taking mp3 unlike copying a map, there is no need.
It is very responsable to ask for mp3, so you can use savefrom to mp3 and put in your map, so it is very simple, however you need permission to use that song