Somehow, it seems Boing Boing never covered this 2009 project from Austrian composer Peter Ablinger: a "speaking piano" that recites the Proclamation of the European Environmental Criminal Court at World Venice Forum 2009. The keys are struck by solenoids, and the resulting sound mimics human speech. The video is a TV news report in German, but what the piano "says" is all English.
There's a translation here, and more at an archival Hackaday post.
(thanks, Mikael Jorgensen!)