Think about the amount of variables we can manipulate and how much we can manipulate them.
We obviously have melody and rhythm, but there is also pitch and most importantly: sound design. With the help of computers, we manipulate a sound to the point where it sounds completely different.
Now, we can manipulate all those things a LOT. A melody is a complex string of sounds that form a nice pattern. Eventually, we will struggle to stay original while steering clear of incoherent noise. Still, we have rhythm to play with. A change in rhythm can completely alter the emotion a song conveys. The same goes for key changes. Lastly, sound design again. The possibilities are pretty much endless with this one.
Put all of that together and you have a huge variability range.
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