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.
Austin Roberts (singer) Austin Roberts (born George Austin Robertson Jr., September 19, 1945) is an American singer and songwriter. His most successful recording was 1975's "Rocky"; a transatlantic Top 40 hit single.