I'm not sure about brighter or more melancholy, but there is a difference. I think it also boils down to the style.

Pop/Rock music tends to largely be written in keys like D, E, F, A etc. Maybe that's because those composers come from guitar background.

Jazz (and Latin) often sits perfectly in keys like Bb, Eb, Ab.

My own taste is to give me Eb any day. It's rich and warm.


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