If it's any comfort, when I sing an Irish or Scottish song, I often find a brogue creeping into my Midwestern voice.

Voices do what they want, you know. All this talk of accents, of ethnicity, of consumer durables (for heaven's sake!) originates in the analytical left brain. The voice, through hearing, is connected to the lizard brain at the base of the brain.

The hearing and the voice do things the left brain cannot begin to understand.