In the Tang, people seeing off friends who were heading west often went with them as far as Weicheng.
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Wang Wei's farewell poem 《送元二使安西》 opens 渭城朝雨浥轻尘, "morning rain in Weicheng settles the light dust", so the song made from it is also called 《渭城曲》. Today a district of 咸阳 carries the name.
