Rap lyrics seem to be just one use case for their technology. And rap itself is a niche that's easy to build an audience/test case with. I think the tech itself

Rap lyrics seem to be just one use case for their technology. And rap itself is a niche that's easy to build an audience/test case with. I think the tech itself applies well to things like books as demonstrated by things like notation in Kindle books. It probably just needs a format different than the thin-column layout they currently have.