Over at Eurogenes there is a paper containing the full analysis on 3,000 something Sardinian genomes.
The paper notes the exceptional closeness of the Gennargentu Regione to that of Neolithic genomes; Sardinians are already close, perhaps the closest of any living people.
Bitti hugs this range for which this strange style of music, tenores di bitti, is known. Always a quartet, the men sing in octave 5ths, and the base is guttural, which occurs nowhere else in the modern West.
It has been proposed that some of the Neolithic monuments provide acoustics suitable for this style of music, specifically for the tholoi of the North Middle East. Sorry, can't remember the author at the moment.
Many great songs on Youtube. Also, on the Wiki page the voices are broken out See demo.