It looks like folks at Yamaha were inspired by it and they have figured out a way to play the piano using Siri.
Yamaha hasn’t used a Siri Proxy like other hacks. They have given Jim Dalrymple of The Loop the following information of how it works:
Take a standard MIDI songfile and convert it to an audio file (while maintaining the MIDI data). The songfile is then sent wirelessly via WiFi to an Apple Airport Express (which is mounted underneath a Yamaha Disklavier reproducing piano. The audio output of the Airport Express is then connected to the analog MIDI inputs of the Disklavier, using a standard audio cable.
Then, you simply ask Siri to play your favorite song from your iTunes library, and Siri responds immediately, by making the Disklavier’s keys and pedal move up and down, recreating the performance, including full orchestration.
You can checkout the video of Siri controlling a Yamaha Disklavier piano below. It’s quite impressive.