The clever part of the strategy I was using in that demo was that all domains are expressed declaratively as datastructures. This meant that the glue language only needed to be very good at manipulating vectors and maps. You built up a structure that represented music, html, or whatever and then just labeled it as such. Interop between domains then becomes pretty simplistic data transformation from one domain's format to another. And given how constrained the glue language could be, you could build incredibly powerful tools that make that easy. You could literally template out the structure you want and just drag/drop things in, fix a few cases that we maybe get wrong and you're done - you've translated tweets into music.

We ended up abandoning that path for now as there are some aspects of functional programming that prove pretty hard to teach people about and seem largely incidental.