Gladys Knight, Martina McBride, Estelle Harmonize on 'Skyville Live'

Nashville lived up to its Music City nickname Wednesday night with the launch of Skyville Live, an online music series that got off to an auspicious start with the legendary Gladys Knight, country icon Martina McBride and British pop/R&B hitmaker Estelle. Broadcast on skyvillelive.com, the concert featured the three women……