I'm not sure if this is of interest or not, but I recently came upon the 1970 album "Voice of the Computer" from New Musical Horizons (https://www.discogs.com/master/955212-V … l-Horizons), which has a number of pieces by M.V. Mathews, although it doesn't specify which computer (presumably the IBM 7094 or system/360).
However, the last song is of real interest. Entitled "Swansong," it's a recording of the last sounds of the IBM 7094 at Bell Labs, Murray Hill, NJ (I believe the one used for the Music from Mathematics albums), done just hours before it was shut down.
From the liner notes: "Swansong (M. V. Mathews)
This piece was the swansong of the IBM 7094 computer at Bell Laboratories, Murray Hill, N. J. The last sections were completed only hours before this excellent machine was decommissioned. But in addition to marking the end of a computer era, it is also the birth cry of interactive graphic composing. The score was drawn directly on the computer using a TV picture tube attached to the computer and a special light pen which allows lines to be drawn directly on the screen of the tube. As in Slider, these lines specified pitches, dura-tions, and loudnesses for the notes of a voice. However, in Swansong, the act of drawing these lines with the light pen communicated their meaning to the computer, so that as soon as the score was drawn the music could be played. Only a few minutes ensued between finishing the score and listening to the result. Hence, it was easy for the composer to revise and develop his ideas. The details of the process are published in Perspectives of New Music, Vol. 6. No. 2, 1968."