http://news.discovery.com/archaeology/conch-ancient-trumpet-sounds.html
and also "Scientists analyze tunes from 3,000-year-old conch-shell instruments for insight into pre-Inca civilization"
http://www.sciencenews.org/view/generic/id/65784/title/Ancient_trumpets_played_eerie_notes
and also "Scientists analyze tunes from 3,000-year-old conch-shell instruments for insight into pre-Inca civilization"
http://www.sciencenews.org/view/generic/id/65784/title/Ancient_trumpets_played_eerie_notes