Some programmers initiate music composition systems with fractals or algorithms which the computer then performs transformations on, such as playing the input backwards, upside down, upside-down and backwards, faster, slower etc… And then the program performs transformations on the transformations.
If you were wondering just what exactly are the properties which fractals and genetic algorithms have that allow them to generate music similar to what humans make, it's an aperiodicity but which isn't completely random. There's structure, but it's often open ended and infinitely long. This is somewhat similar to human music but not spot on. Sometimes in order to identify the structure within an algorithm, you’d have to look at thousands of individual members within it before you could find the pattern. Those specific algorithms are not normally used for music composition. So, just because it’s an algorithm doesn’t mean it’s good. Even a good algorithm only creates pseudo-human-like music. It might repeat patterns in an ever changing way, which could be mildly interesting at times, but they never fool experts into thinking the music was created by another human let alone by another expert. It usually sounds quite amateurish.
Below is only one quarter of an example of a gene sequence. Computer programmers can assign different musical parameters to the recurrences of the amino acids adenine, guanine, cytosine and thymine to create different effects.
… 1 ggcagtggtg ctgggagtgt cgtggacgcc gtgccgttac tcgtagtcag gcggcggcgc
61 aggcggcggc ggcggcatag cgcacagcgc gccttagcag cagcagcagc agcagcggca
121 tcggaggtac ccccgccgtc gcagcccccg cgctggtgca gccaccctcg ctccctctgc
181 tcttcctccc ttcgctcgca ccatggctga tcagctgacc gaagaacaga ttgctgaatt
241 caaggaagcc ttctccctat ttgataaaga tggcgatggc accatcacaa caaaggaact
301 tggaactgtc atgaggtcac tgggtcagaa cccaacagaa gctgaattgc aggatatgat
361 caatgaagtg gatgctgatg gtaatggcac cattgacttc cccgaatttt tgactatgat
Just about all of the contemporary composers in the classical vein that you might run into at a university, although they always say a trained composer makes better music than any system, have studied the use of the Fibonacci series, fractals and algorithms etc... If you start talking about those, it's not like the classical composers will say, “What are those?” They've usually already explored genetic algorithms and such. So, it seems fractals and the like are not just for computers.
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