No one can see the whole of the piece except me

a concert for music
that I've written
dozens of singers and musicians
on a stage
I am arranging
where they each need to stand
a sheet of paper
indicating 81 parts
divided into 3 sections
I ask single musicians
to perform short pieces
then groups of singers
we are in a vast concert hall
crowds of workers
are moving about
whispering in the auditorium
behind me
what is clear to me
and what is frustrating to me
is that no one
can see the whole of the piece
except me