British musician Hugh Coltman will be performing with French Quarter as part of the Istanbul Jazz Festival at the UNIQ open-air theater on July 15. His album released last year, "Shadows - Songs of Nat King Cole," sheds light on the world of the late singer and jazz pianist in an America where "segregation and racism were rife," according to Coltman's website.When: FridayWhere: UNIQ Open-air Theater