You mean like an mp3 tag? Probably not. You could try attaching the desired mp3 to your post, but that'll probably be frowned upon by many.. because I always had this feeling that everyone hates attachments.
Although whenever I click on an mp3 link on any website, it sometimes uses QuickTime to play it for me in another tab, so maybe there's a way to get something like that embedded into posts as long as the mp3 is hosted by another website, but again... probably not!
"I have a habit of falling in love with souls who have yet to be at peace with their bodies, their minds, their weaknesses. I try to build them, to find the parts of them that are missing in me.
I end up with holes in my chest."