If you read up a bit on how mp3 compression and GSM work then you'll find that in essence they rebuild the sound from a very limited number of frequencies.

Very nice find, and extremely impressive the speed with which the keys are manipulated.

I wonder if it is possible to have a human learn the key sequences of the dominant frequency bands and make a piano speak a word or two.

In neuromancer there is a head in villa straylight that speaks with organ pipes iirc.