It is imperative that if you choose to put these .js documents on your server that you always have the most current version. An easy way to avoid this maintenance factor is to have your .html documents pull the javascripts off of Beatnik's server.
All you have to do is copy this bit of code just below the <body> tag in your .html document:
<SCRIPT SRC="http://sonify.beatnik.com/music-object.js"></SCRIPT>
This way everytime someone views your page using the JavaScript
the browser will go to Beatniks' server and grab the needed up-to-date "source" code.