{{explanation}}
Music in 20 bar phrases

1-6
: 1s+2s+3s dance reels of 3 across (2L LSh to 1M, 2M LSh to 3L to start)
7-10
: 1s+2s set, cast to 2nd & 3rd places **while** 3s NHJ dance up to 1st
  place
11-20
: 3s+1s+2s set advancing & dance allemande (end 2 1 3 4)
21-26
: 1s+3s+4s dance mirror (reflection) reels of 3 on sides (1s in/down, 3s
  out/up. 4s in up)
27-30
: 1s dance down to 4th place **while** 3s+4s set, cast up to 2nd & 3rd
  place (end 2 3 4 1)
31-40
: 3s+4s+1s set advancing, face down & dance promenade (down Ladies' side,
  up Men's side)