Music generators
Look at the internet audio experiment site.
You’ll see four links on this very basic site one or two of them are really pretty interesting, especially I think, the first on the list which is a Flash Player Piano devised by Rob Wright at Aleotronic Music. Click on the engine box to see it at work.
Ok, the graphics is very 1990s but there is a certain naive charm to it.
flashmusicgames.com/generator