Mixcloud's widget for Joomla users (2.5+). Simple add a link to your mixcloud (or someone else's) and the player should load up. This is simply a module which you can place anywhere, you can alter the size, and colour of this widget.
Also..it validates!.. Yes thats right, it passes W3C validation correctly on most used HTML doctypes, thats HTML4.0, XHTML1.0 and HTML5.