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Re:Show HN: Jukedeck – create unique, royalty-free music for... by ireflect on Wednesday December 09, 2015 @04:41PM (#10706970)
This is a pretty big question with lots of potential answers, but the answer you're probably looking for is the rules of harmony.

https://en.wikipedia.org/wiki/Harmony

tl;dr: Frequencies that are related by some simple ratios are defined as "intervals" which are organized into scales. A handful of those make up the vast majority of popular western music and "sound good together".

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