In theory, I think it's doable, but you'd have to build some sort of interface for it. Right now, all that exists are the low level foundations.

The KL model does sing! Max Matthews and Bell Labs produced "Daisy Bell" using a very similar model 1960:

http://www.cs.princeton.edu/~prc/Daisy.mp3

This was the inspiration for HAL to sing Daisy in 2001: A Space Odyssey.