Liu Chang Qin (709-785) is another Tang poet who is not very well-known.
But one of his poems stuck a chord with me:
Listening to Music
From the seven* strings come a sad melody,
As desolate as cold pine trees.
Though I love the old melodies,
People are not willing to play them these days.
* An ancient Chinese instrument, the Gu Qin, has seven strings.