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many factors come in
it could be a good melody, or progression, with clever chord changes.
it could be just a good bassline, especially one that compliments the other elements of the track
the vocal could be particularly good or memorable
and in many cases, it could be some of the background elements just work, beit a good acid line, a secondary melody, some strings, anything really.
It also helps if it doesn't get overplayed and remade with shit vocals for commercial purposes 
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