After frustratingly trying to make the ivoon embed codes work with a text widget, and many other pirouettes... we finally realised that Wordpress has a specific widget for music:
So forget about ivoon and follow the 3 steps given at this widget.
Upload your music here and give your e-mail account information.
Copy the embed code to the widget and update.
See sample at http://wildhicock.wordpress.com/
Enjoy!!
