1. Upload your mp3 file to a cloud source such as opendrive www.opendrive.com
2. Right click on your mp3 file once it has been uploaded. Click on 'Link' and copy the HTML embed code.
3. Create a new Blog post or page. Select the HTML option at the top left of the page. Paste the HTML code onto the page.
4. Your mp3 will appear on your blog like the one here.