Bach And The Sentry

Watching the dark my spirit rose in flood
On that most dearest Prelude of my delight.
The low-lying mist lifted its hood,
The October stars showed nobly in clear night.
When I return, and to real music-making,
And play that Prelude, how will it happen then?
Shall I feel as I felt, a sentry hardly waking,
With a dull sense of No Man's Land again?