The sound loop you are probably listening to right now (if your browser is able to automagically play MP3) is my modest creation of a short afro-cuban Rumba Guaguanco with the wonderful open source drum machine Hydrogen which is freely available from http://hydrogen-music.org.
The source file for the loop you are listening to is available for download right here: guaguanco.h2song.gz. I consider this file as a very modest addition to freely shared musical culture and therefore you can do whatever you please with it. To get a proper sound representation with Hydrogen you need to download and load the following drum kit: sourceforge.net/projects/hydrogen/files/Sound%20Libraries/Main%20sound%20libraries/ErnysPercussion.h2drumkit
Luckily, Hydrogen also does support non-*NIX operating systems, so Windows and MacOS users can use it too.