Poems of Meng Jiao
Reading aloud Zhang's "Jade Collection"
Heaven's treasure, the morning star, is dead
And all right conduct is extinguished.
How is it the great roots of China's ways are
Buried and royalty's brilliance exhausted?
An ancient master is today again among us,
His cultured expression almost without a flaw.
His brush establishes our kingdom's rise and fall.
His plea displays true strength of character.
In autumn coolness the concerts are many.
In a limpid pool, a huge round moon.
Who will perform this poem collector's work
So it will endure and not fade away?
The title seems to refer to a blockprinted collection of poems by someone surnamed Zhang. This could be either of the Zhang Ji's we have encountered. But if neither of them were a "poem gathering official" (采诗官), it must be someone else. Such an official was sent by the emperor to gather popular poems and songs as a kind of reading or measure of popular thinking. So these poems could be Zhang's poetry inspired by what he gathered or they could be the gathered poems themselves. I would guess, from Meng Jiao's description, they are the former.
Also interesting here is the statement that in the autumn's coolness there are many "concerts" of poets (who are also, of course, officials or other members of the cultured classes) playing their qins in public and chanting their poetry.
And lastly, there is the allusion to some recent royal death. We can't know who Meng Jiao is thinking of here. But his audience certainly would have. It might well have been the death of emperor Dezong, who died in 805.