The sheet music I have has this in "C" (starts on A and D, ends on D, no sharps or flats in key signature). The Darton singers usually transpose it so it starts on C and F, and has 4 flats; so these midis are at that pitch.
- both lines
- both lines, an octave down (for male singers)
- top line emphasised
- top line emphasised, an octave down
- bottom line emphasised
- bottom line emphasised, an octave down
It works well wherever is comfortable for the singers: starting a fifth apart, in adjacent voices.