You group like with like. Easy, eh? Now how you do that is where the talent comes in. Record stores like to do it by the person performing the music. That fails when the person decides to play something in a different style than they usually do (e.g., Paul McCartney). So, the only good way to do this, that won't fail or change over time, is to group music by it's own internal characteristics ... just as we group biological organisms by their DNA. The many, many characteristics of even one bit of music make this a tough task. Do you group all music in 3/4 time together? No. All music without words? All music with drums? All music in an A-B-A form, all music in D major??? See how hard it is!Another way that doesn't work well, but that people try to use is to group music by time period. Music from the 1950s, 1700s, 1990s, etc. Just look around at the awesome variety of types of music being created today, and you'll realize that this classification scheme won't work either.So, in the end, the best method is to use the music's own characteristics, but in more than one dimension. That is, where you may have more than one bit of music in 3/4, you need to also look at their harmony, instrumentation, form, rhythms, scale, melody, words (if any) and so on. Music where all of those things are similar should be grouped together... and maybe, if there are enough, they could constitute a "genre."Good luck!
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