MySQL driven XML from PHP

I want to make - lets say a playlist with song description.

I have already set up the framework and MySQL running.
The page gives me in a list the names of the songs:
Song 1
Song 2
Song 3

List is driven by MySQL database. I also have onDoubleClick. What I want is when I doubleclick an item, some columns from that rows item in MySQL database, to be send to XML file.

So, I want something that will select for example column "art". Because the item clicked is driven by MySQL already, don't think it's a big problem. But then I want containment's of the column "art" to be send to the XML file, and dynamically change it accordingly.

Thanks, Yan