SOLIDAC was a small transistor computer (1024 words memory, 32 bit) designed by Paul Thomas (late of Brock University, Ontario) and built by Tom O’Beirne of Barr & Stroud, the Glasgow precision instrument maker. The machine was commissioned in 1963, after Thomas had left Scotland for Canada. It was in use at Glasgow University until the 1980s.
Although running at a rather pedestrian 30 kHz, O’Beirne did find some interesting applications. This included producing music from it, a couple of examples being:
There’s a video linked in the comments, and from the description there we find a page which says
The track that follows that of Tsuchiya is Enneadic Selections by Thomas Hay O’Beirne, another man as interesting as unknown to most people. O’Beirne is a Scottish mathematician who during the sixties began to be interested in non-scientific computer applications, like the music. In 1965, on the occasion of a public meeting, O’Beirne was able to come up with an intervention focused on music, numbers and computer. In the following years he conducted further experiments in computer music with a computer Solidac, by developing a software called Orpheus, which probably was also used for this Enneadic Selections (1968). It is a song featured with dated timbrical solutions, but O’Beirne tried a curious synthetic reproduction of sounds of bagpipes, as you can hear from 3:32, perhaps a tribute to his native land.
(As noted, it’s not certain that we’re hearing Solidac itself here.)