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To throw another wrench into the "Major-Happy/Minor-Sad" there's things like the use of Minor keys for other emotions, most famously the solemnity of Christmas in a lot of baroque works. You can also look at the modes, and their relations to happy/sad. Some of them sound more major, but sadder, and others more minor, but happier. Then you could look at how some keys used to have certain emotions/scenarios implied (some still do), and then you could look at how older tuning systems might have influenced that... Sorry. I get excited about this kind of thing.