the computer based music composition systems have rules for the computer to follow such as; the more frequently you rise to the next pitch from the last one, the more likely it is that you will come back down. Mostly, the results all hover around an idealized optimum and lack variety. There are also ways to test the output of rule based systems for fitness but those systems never fool anyone into thinking the music was made by a person.
One observation about classical music which applies to pop styles as well is that, after analyzing 1000s of classical compositions, the nonsense about hitting the climax only once is more frequently broken than not. That rule was broken so often that it could hardly be called a rule. The other nostrum was reversing direction after a leap.
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