ohh, okay. THAT makes more sense.
There is no way to do it with autochanging BGM. There is still a way you can do it though:
1. Create a switch (ill call it "DifBGM).
2. turn the switch on before you transfer the player over to the second map if you want the different bgm to keep playing, off if you want the auto-start bgm to
play.
3. Turn off the autostart bgm on the second map (uncheck the box).
4. Create a paralell process that has 2 pages (on the second map):
Page1 should just play the bgm you would normally have auto-start (this will function the same as an autostart)
Page2 should have the condition of switch "DifBGM" being on, and play the different bgm from the event.
Then, when you exit the map or want to switch the bgm back to normal, simply turn off the switch.
Here is a demo of what I mean:
http://www.sendspace.com/file/be49jfEDIT: There is no error with any file Blizz. Its just how RPG Maker works. I got the same thing he did. This fix works tho. Its what I use all the time in my game.