Say I have a song playing in a certain area and I don't want it to play outside of it, is it possible to make a part that prevent music of passing trough it?
Trying to do this by the Audio's perspective.. no. But there is an alternative; You could use Region3 or Magnitude to check if any players are in the wanted area.. if they are, clone the sound into their PlayerGui. Otherwise just change the Volume of the sound, the amount you can hear it depletes as you are further away.. adjust it to your needs.
Hope I Helped
+1