Home page of NDSU Extension Service - Mercer County. NDSU Extension Service in Mercer County gives local residents easy access to the resources and expertise of North Dakota State University. Through educational programs, publications, and events, extension agents deliver unbiased, research-based information to Mercer County citizens.
World records and extremes of vocal range. 1  The highest vocal range in the world, according to the Guinness Book of World Records, is that of Georgia Brown; a Brazilian female singer who produces unusually high pitches using a whistle register. Her range extends eight octaves, from G2 to G10.
Adult contemporary and Adult Contemporary redirect here. For the Billboard music chart, see Adult Contemporary (chart) . Adult contemporary artist Celine Dion is one of the biggest international stars in music history, selling more than 220 million albums worldwide.