Blood Instructions:

BC1 begins with a long held crescendo on a low C - ending abruptly
BC waits a bit before continuing this pattern and looping it.
Vox trickle in and loop asynchronously, embellishing and improvising.
All wind players begin to slowly jump on board with the leader: BC1.   
Drumset improvises in free time, but steps out of the way when the wind players are playing their note.
The vocals will be cued from section to section, freely performing each phrase.
As the piece progresses, the wind players add modulations, overtones, and embellishments to their note, increasing the variation over time.
The piece shall end abruptly during section "C"