"In other words, finding sexually interested humans to mate with might have been done with melodies?"

Right on, wilco. Go rent the Jackie Chan movie "Twin Dragons," where Jackie as John Ma, the famous conductor, courts the beautiful singer by playing Beethoven for her.

See if you can find a chick or your main squeeze to watch it with you. It's very romantic.
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What the hell is "heterodyne" anyway?
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PS You can always fast forward through the fights, which tend to go on for far too long.