my Andie was doing spot on vocal arpeggios at 11 months and mimicking tunes impeccably before she could form full sentences. She could hear and mimic harmonies at 6 or 7 years and started constructing by ear on the spot harmonies and descants when she was 11 or 12. She never had formal training beyond what was offered in woefully inadequate Virginia rural school system.

She was constantly exposed to music from birth, ususally FM radio Rock, some classical, weekend church hymns and me singing any and everything in between.

I used to think and still do that she not only did sing but was she was SONG itself. I know that statement seems like grief induced maudlin rubbish. But there ya go.

I came from a house full of singers and musicians (generations of singers and musos) and I couldn't carry a tune if it had a handle on it until I 14. When I started teaching myself piano something connected.

So taking those 2 scenarios was that nurture or nature?

Al think I would like to check out that Sigma. I will PM you.