The key finds me.

For any song you play, if you change keys, it will FEEL different--sure, the pitch changes, obviously...but it also has a whole different feeling...something intangible to explain, but I respond to that intangible feeling more than anything else.

You can make a song more comfortable to sing by changing keys, but it might also kill that "feel".

I can't really explain or describe that "feeling"...but it is what dictates the key for me, not comfort or ease of playing.