How to insert Audio into a WordPress.com blog

I have been researching how to insert audio into a WordPress.com blog I have, and realized that I need to Upgrade Space in order to be able to upload audio files from my computer.  Otherwise, the only way of playing audio on the blog is to use the default player and use a shortcode for linking to the audio file hosted somewhere on the internet.

Take a look at this very useful guide I found on this.

http://en.support.wordpress.com/audio/