So basically, it would work like the centerprint event, only for the person clicking on the object? Why not just use music bricks for different areas? I've heard the "too loud" error has been fixed so you could just use music bricks.
Dude, stop trying. It's like you're purposefully not understanding people.
To set music to only play for a single client would probably require that the player also has the events. Not even sure how you'd attach the music thing to the player, although I'm sure that would be possible.
The major problem is most people don't even download Music because it's excessively large files to download. Think of it like this: You hate some music? Imagine the host likes it, and puts a whole ton of it on their server. Would you take kindly to having to download it all, and probably listen to it? No.