You could use Playlist and then add in the html code to your blog. You can do one song or have a huge playlist. And if you change your songs on playlist it automatically updates the blog. You don't have to reload the code.
In blogger, go to customize, then click on "add a gadget". Then choose HTML/java script. Then copy the playlist code into the content box. Make sure you use the code that is made for blogger when you copy it from playlist.