Graham Stack  has written and produced hit records for many artists including a singer who relinquished her American what?
Tina Turner Tina Turner (born Anna Mae Bullock; November 26, 1939), is an American-born Swiss recording singer, songwriter, dancer, actress, and author. Born and raised in the Southeastern United States, Turner relinquished her American citizenship after obtaining Swiss citizenship in 2013.
Ashley Roberts Ashley Allyn Roberts (born September 14, 1981) is an American singer, songwriter, dancer, choreographer, actress, model, presenter, and television personality, best known as a former member of the modern burlesque group and dance ensemble The Pussycat Dolls. She departed from the band in February 2010, in order to pursue a solo singing and acting career, but also due to the overemphasis on the band's main singer, Nicole Scherzinger.