I don't think just putting it in a standalone will work either, I think you have to make a standalone while you have it in your gameguru already.
If i'm right the process should be...
1. put title.ogg in your titlesbank/default (or whichever you use if you have a custom one)
2. load gameguru
3. load your map
4. test your map
5. save map as standalone
then the standalone should play the music
that's how It looks like it used to be, if it's changed with the new menu lua I don't know
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