I setup soundcloud for highmayhem (high mayhemers can now upload tracks to it. Ask carlos for the password) You can also create your own account.
To embed your song on this site:
From your soundcloud song, click share, click more, click wordpress. Copy and paste the link into your page or post in highmayhem.org. If you choose to customize your player, be sure to copy the wordpress link (at very bottom). If you want the extra small player, you need to be logged into soundcloud as a paid user. Viola!
more info on this from soundcloud
Here is an example: