maybe I'm missing something here but as I understand it specific keys are not associated with specific feelings, at least not in the way major (happy) and minor (sad) are. for example, if I write a sad sounding song in the key of Am and then transpose it to Em (or G#m or whatever minor) it does not sound any less (or more) sad. And if I play the blues in G and then transpose to Bb it is still the blues. I guess each person's personal preference and experience may affect this but the relationship of the notes to one another is identical after transposition.