Back To The Roots
One of the oldest computer made music record was recently demonstrated in dedication to the 60th anniversary of Baby Machine, a predecessor of modern computers.
The record was made by BBC in autumn of 1951 using the Manchester University built Ferranti Mark I which played Baa Baa Black Sheep and a short version of In the Mood. Before it was believed that the earliest record was produced by IBM machine, based in Bell Labs, USA.
Ferranti Mark I was not the primary computer to produce and record music sounds. Few months prior to the mentioned above record there existed another one that was compiled on SCIRAC, the first Australian digital computer. This record (Colonel Bogie) was not preserved.
Ferranti Mark I is considered to be the foremost commercially available computer. This model was originally created in February of 1951.
A Source: ThatsJustMusic.com