 Complete the following phrase:  Kayahan Açar 29 March 1949  3 April 2015 was a Turkish pop music singer-songwriter. He was an accomplished composer, consistently ranking among the best-selling Turkish musicians of all time. Kayahan composed all of his own material and released more than eight best-selling albums during a career spanning three decades. Kayahan released a number of compact cassettes, CDs and albums and had major singles. He represented Turkey in 