The oldest playable musical instruments were discovered in and are thought to be between 7,000 and 9,000 years old.

Answer is: China (site of Jiahu in central Henan Province).
The World oldest complete, playable, multinote musical instruments is six bone flutes dating from 8000 to 9000 years ago (the Neolithic period). Best preserved flute is eight inches (20 centimeters) long and have between five and eight holes.

Why do you have to ask such hard questions.