I'm a musician and I found this XSPF plugin very useful. I wanted to create a popup music player on my website that always stays open so when visitors navigate through the site the music doesn't get interrupted. I couldn't find a Wordpress plugin that would accomplish this so I just made one. It's very simple but it gets the job done with minimal effort. I also created a simple page template that can be used as the popup so it blends nicely with your site. Hope you find it useful!