Martina McBride joins forces with Gladys Knight

Country music icon Martina McBride, soul legend Gladys Knight and R&B singer Estelle are among the stars tapped to perform on a new Nashville-based concert series called "Skyville Live." The three female artists will be featured on the inaugural episode of the web series, which will air live from Nashville, Tennessee on Jan. 14. The series will be aired once a month from the country music Mecca, and each episode will pair two iconic artists with an emerging singer in an intimate performance