Who's to say that, when I sing the song, I'm not actually singing about a completely different girl called Shenandoah whose name was pronounced differently?

Some singers sing Barbera Allen, some sing 'Barbree Allen'. Doubtless that too annoys some listeners used to hearing the song a particular way.

Furthermore, someone with a very strong regional accent from the north of the USA is liable to inflect any given 3 or 4 syllables differently to someone else with a very strong regional accent from the south, east or west of the USA... so isn't this a rather moot point?

I'm more interested in whether the singer singing a song is doing so beautifully.