New York -- Pianist Herbie Hancock will celebrate the special connection between Turkey and jazz music forged decades ago when the Turkish ambassador opened his residence to white and black musicians at a time when segregation held sway in the U.S. capital.

Hancock, a Unesco Goodwill Ambassador, is organizing a gala concert with jazz stars from around the world on April 30 at the famed Hagia Irene in the outer courtyard of Topkapi Palace in Istanbul, which has been designated the host city for the second annual U.N.-sanctioned International Jazz Day.

"There's an amazing history of the relationship between Turkey and jazz," Hancock told The Associated Press in a telephone interview ahead of Tuesday's official announcement of the 2013 International Jazz Day program.

It began in the `30s and `40s when the two sons of Turkish Ambassador Mehmet Munir Ertegun pursued their passion for jazz by frequenting the capital's...