In August of 1951, BBC reporters travelled to the University of Manchester and captured what is now believed to be the earliest recording of computer generated music. The performer featured was a Ferranti Mark 1 computer -During the session, the temperamental machine managed to work its way through Baa Baa Black Sheep, God Save the King and part of In the Mood.
Following one aborted attempt, a laughing presenter says: "The machine's obviously not in the mood." Beyond the charming human incedintals, the machine's voice is surprisingly pleasant - starting out sounding like a slightly uptight bassoon. Time to start on that commemorative Fentari sound-a-like synth. Listen to the recording - 'Oldest' computer music unveiled
http://blog.makezine.com/archive/2008/06/oldest_known_computer_mus.html