* Package name    : openutau
  Version         : git
  Upstream Author : stakira
* URL             : http://www.openutau.com/
* License         : MIT
  Programming Lang: C#
  Description     : Open singing synthesis platform / Open source UTAU successor / vocaloid clone

This is a clone of a shareware clone (UTAU) of the proprietairy vocaloid software (hatsune miku etc). It's a speach synthesiser, targeting specifically singing. UTAU been closed source, windows only, very old and quirky to use (you need to install Japanese fonts...). There's plenty of demand for this kind of thing and it's pretty much unique in the open source world.

Here's a demo
https://www.youtube.com/watch?v=tew1EyyLASs

Debian doesn't has anything like this in it's repos. It's unique, with lots of interest.