Song Shu 《宋書·樂志一》 Book of Song quoting earlier work by Fu Xuan (傅玄), Ode to Pipa (琵琶賦). Original text: 琵琶,傅玄《琵琶賦》曰: 漢遣烏孫公主嫁昆彌,念其行路思慕,故使工人裁箏、築,為馬上之樂。欲從方俗語,故名曰琵琶,取其易傳於外國也。 Translation: Pipa - Fu Xuan's "Ode to Pipa" says: "The Han Emperor sent the Wusun princess to marry Kunmi, and being mindful of her thoughts and longings on her journey, instructed craftsmen to modify the Chinese zither Zheng and zhu to make an instrument tailored for playing on horseback. Therefore the common use of the old term pipa came about because it was thus transmitted to a foreign country."