 It has also been claimed that the fall of Kucha led to the decline of Indo @-@ European culture in the Tarim Basin and its replacement by first Chinese and then Turkic culture . In fact , the opposite is true . Kuchean culture flourished during the seventh and eighth centuries and Kuchean music was popular in the Tang capital , in part due to the movement of Kuchean musicians to the Tang court . The Turkicization of the Tarim Basin is a later development that came after the end of the Tang dynasty and had no relation to the earlier Tang protectorate in the Tarim Basin . 
