Simple music program where turtles running on rectilinear coordinates played a musical note whenever they ran over a colored square. The turtles proceeded in a straight line unless they ran over a turn(left|right|around) square.

originally an exhibit at the exploratorium (running on, what was obviously an Amiga), since made into a windows application by Maxis.

The maxis version had some added features, (zoom, choice of bugs, added control blocks, adjustable tempo) but still only had 4 'bugs' at a time. It prompted much musing about a 'professional' version with more/other options. (At this point it becomes a Logo-like programming environment which just happens to have its first set of applications be 'music')