CDM highlights this interesting approach to music sequencing. More than just incredibly-fun-looking music software, Al Jazari is an art performance and installation (which also appears to be high in fun) -

Al-Jazari is livecoded entirely by gamepad, and employs a simple graphical language to allow robots to interact with each other and move over a terrain populated by audio triggers. The running code is displayed and edited in thought bubbles over each robot. For upcoming performance dates see this page.

The software is available for download but does require compiling/installing various supporting programs. – Al Jazari