I would regard this as a somewhat failed experiment*, or maybe one that could have been better executed. Worth a look though.

* The seed text should have been spoken by someone who had good English without a speech impediment.

Why would anybody want to try to make a piano talk??!!
Can't people simply enjoy the natural sounds of a piano?

I think they should use this idea in a horror film, it's creepy beyond belief!

A well and truly whacky idea, and doubtful as to what value it might have....but interesting all the same.
The kid doing the reading actually enunciated very clearly - well done him for reading out an English text when he's German.

There is a far better piano that talks and it belongs to a little American boy called Sparky.

Well I thought it was brilliant. The next step is to notate some pieces that are human-playable (maybe 8-hands/one-piano) to make some speech.

That gave me nightmares when I was little: "Spaaarkeeeee!"

I've always loved it! Sparky is just SO polite to his piano teacher and now, some 60 years after I first heard him, my own pupils can hardly believe their ears. I still listen to it every now and again because I think the slightly distorted piano chords that represent the piano's voice are so brilliantly done. I often lend my copy of it to my very youngest pupils, and - sophisticated as young people are these days - they hardly ever guess he was simply dreaming.