Much like the rest of the site, the embedded player is not in its final design. It will be redesigned along with the rest of the site once the site is a bit closer to beta. But hey, it works!
Artists, you're welcome to share your Pony.fm uploads here on MLP Forums in Octavia's Hall or anywhere else using the embedded player. Using it functions exactly like embedding YouTube videos - just paste the URL to your track into the editor...
...and it will automagically become a Pony.fm player. The [media] tag is also supported, should you prefer to use that.
If you have your own site you'd like to embed a Pony.fm track on, this is what the HTML code looks like:
<iframe src="https://pony.fm/t1/embed" width="100%" height="150" allowTransparency="true" frameborder="0" seamless allowfullscreen></iframe>
Just replace the "1" in "/t1/embed" with the ID of the track you wish to embed, and its embedded player will come up.
Finally, have a teaser: a feature for embedding tracks on sites that don't have built-in support for Pony.fm (like MLP Forums now does), or allow you to use custom HTML, is coming soon!