After all, there have been computer-generated writings and music for even longer than that.
In "Computer Music", Scientific American, Vol. 201, No. 6 (December 1959), pp. 109-121 , available at https://www.jstor.org/stable/pdf/24941187.pdf we can read about 'chance' and 'almost random' music:
> A second and rather well-known example of chance music is Mozart's "A Musical Dice Game." This piece, one of many similar "compositions" produced as parlor games in the late 18th century, consists essentially of several dozen assorted measures of music, the order of which is determined by rolling dice. A more modern random work, "Imaginary Landscape" by the American composer John Cage, is "scored" for 12 radios and thus derives a strong element of randomness from regional and temporal variations in radio programs. ..
> John R. Pierce of Bell Telephone Laboratories, an authority on information theory, has demonstrated other approaches to the composition of simple "probability music." In one, a sequence of chords is chosen by means of dice rolls and a table of random numbers; in another, a series of volunteers each contributes a measure. A number of European composers have produced more elaborate random music electronically by causing random sequences of electrical signals to trigger sequences of tones. ...
It then goes on to describe how the author worked on the Illiac Suite for String Quartet.
After all, there have been computer-generated writings and music for even longer than that.
In "Computer Music", Scientific American, Vol. 201, No. 6 (December 1959), pp. 109-121 , available at https://www.jstor.org/stable/pdf/24941187.pdf we can read about 'chance' and 'almost random' music:
> A second and rather well-known example of chance music is Mozart's "A Musical Dice Game." This piece, one of many similar "compositions" produced as parlor games in the late 18th century, consists essentially of several dozen assorted measures of music, the order of which is determined by rolling dice. A more modern random work, "Imaginary Landscape" by the American composer John Cage, is "scored" for 12 radios and thus derives a strong element of randomness from regional and temporal variations in radio programs. ..
> John R. Pierce of Bell Telephone Laboratories, an authority on information theory, has demonstrated other approaches to the composition of simple "probability music." In one, a sequence of chords is chosen by means of dice rolls and a table of random numbers; in another, a series of volunteers each contributes a measure. A number of European composers have produced more elaborate random music electronically by causing random sequences of electrical signals to trigger sequences of tones. ...
It then goes on to describe how the author worked on the Illiac Suite for String Quartet.
Again, this is the 1950s.