What's interesting about these songs changed from a minor key to a major key is that they don't go from sad to happy (like they keep on saying), but from sad to bitter-sweet.
There's just certain choices, I'd say more rhythmic, pentatonic based choices a musician makes that make sense in a minor scale that you usually wouldn't do in a major scale. Mostly involving that whole step from the tonic to the dominant 7th below it. Am I hearing that right? Does that make sense? You wouldn't just flatten a note to the sad, longing, symbolist, emo, Debussyesque major 7th, most of the time.
I mean, I would. Because I like those golden sunset you-can-never-be-happy-all-the-way major 7ths. Easily the greatest note. Or whatever you call it. Can we agree on this? It's the universe's most ironic note. The flatted fifth, the devil's note, is just sort of goofy sounding sometimes. I lacks a certain seriousness. Maybe that's a good thing to you. But, I don't know, it has to be used carefully.
I guess you could say that once you start using the major 7th and a preponderance of whole tones, your music starts to turn into a boring, sentimental mush. I totally see that.
Anyone else find that talking about modes and scales seems to always have an analog in the visual arts, or any abstract expression. Our ways of breaking down music are so mathematically precise. Color palettes and hormonal emotional relationships seem like they should be a few equations away. But it is not so clear.