Liking much psychedelic and alternative type of music, plus some early new wave and jazz, I like a lot of the minor keyed type music.
But I originally got more into vocal and musical styles more than form and song structure, outside of plodding 4 beats. I have looked at the different keys to have more zest and retain my musical interests.
Trad music has quite a bit of that.
I did not try much more then post eighties type music before I came on the internet. So I have been pretty much winging it and then trying to prose up for all but a few of my recordings of what I originally did.
And rewriting a few of my older recordings in a classicist vein.

The key can really change the dynamic in an old song.

I notice that taut pop songs with bright keys seem to be a whole lot better for me in learning song structure, as far as practicing.
Something like Bread catches the synapses more directly then Pink Floyd.
Although I am more into the dark type stuff like Floyd.
I like to try and marry both elements together.
Besides, I'm not all negative or rebellious at all times.

There seems to be more of a dramatic quality applying certain measures of both the bright and dark though.

http://www.f3music.com/444