Yes, sorry, I should have written "sticky post" instead of "latest post". I'm not seeing the player on it: the shortcode is bad, so it may or may not show up, depending on the browser. Shortcode should be:
[gigya src="http://grooveshark.com/songWidget.swf" width="250" height="40" wmode="window" allowScriptAccess="always" flashvars="hostname=cowbell.grooveshark.com&songIDs=23215408&style=metal&p=0" ]
You can use this as a general model and just change the ID number.
I can't check the rest of your posts, because you've got infinite scrolling enabled. (Is that intentional or not?)