For example, when the night time comes, we can make a script do
set.("map1").song["night_song_for_map_1"].
set.("map2").song["night_song_for_map_2"].
set.("map3").song["night_song_for_map_3"].
set.("map4").song["night_song_for_map_4"].
so by triggering the script only once, we can change all of the maps to their special night time background songs. If we want to do this now, we have to check if the player is in a certain map and have to trigger the script each time player enters a new map.