FILE - In this Wednesday, Jan. 16, 2013 file photo, U.S. musician Herbie Hancock performs during a concert, as part of the 10th edition of the Panama Jazz Festival, in Panama City. Hancock, a UNESCO Goodwill Ambassador, is organizing a gala concert with jazz stars from around the world to be held 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. (AP Photo/Arnulfo Franco)

Associated Press
FILE - In this Wednesday, Jan. 16, 2013 file photo, U.S. musician Herbie Hancock performs during a concert, as part of the 10th edition of the Panama Jazz Festival, in Panama City.  Hancock, a UNESCO Goodwill Ambassador, is organizing a gala concert with jazz stars from around the world to be held 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.  (AP Photo/Arnulfo Franco)
FILE - In this Wednesday, Jan. 16, 2013 file photo, U.S. musician Herbie Hancock performs during a concert, as part of the 10th edition of the Panama Jazz Festival, in Panama City. Hancock, a UNESCO Goodwill Ambassador, is organizing a gala concert with jazz stars from around the world to be held 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. (AP Photo/Arnulfo Franco)
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