One work by this man opens by describing "seafarers" who "tell of the Eastern isle of bliss." In another poem by this man, the sounds of a flute on a spring night inspire recollections of the gardens of home.  In a third work, he noted that he was glad to "make the moon and my shadow into friends." The addressee of another of his works went to "the river of swirling eddies" when the title figure was sixteen, and he asked "Which was the real-the butterfly or the man?" in "Chuang Tzu and the Butterfly." Mahler adapted his Chinese Flute into Das Lied von der Erde. For 10 points, name this Tang Dynasty poet of "The River 
One work by this man opens by describing "seafarers" who "tell of the Eastern isle of bliss." In another poem by this man, the sounds of a flute on a spring night inspire recollections of the gardens of home.  In a third work, he noted that he was glad to "make the moon and my shadow into friends." The addressee of another of his works went to "the river of swirling eddies" when the title figure was sixteen, and he asked "Which was the real-the butterfly or the man?" in "Chuang Tzu and the Butterfly." Mahler adapted his Chinese Flute into Das Lied von der Erde. For 10 points, name this Tang Dynasty poet of "The River Merchant's Wife," a close friend to fellow poet Du Fu.
One work by this man opens by describing "seafarers" who "tell of the Eastern isle of bliss.
Li Po [accept Li Bai, Li Bo, or Li Tai-bo; might as well accept Rihaku too]