Bob Isaacs - Grid Square - Maze of Heys
Pete Sutherland - fiddle
Mark Roberts - banjo
Lee Blackwell and Ben Davis - guitars
Harry Aceto - bass
Jeremiah McLane - accordion
Peter Davis - piano
The tune is Julianne Johnson. This was recorded at the Dance Flurry, Saratoga Springs, NY on February 20, 2011. There were about 80 squares dancing in the main hall for the Grid Squares session. This was the first of four dances that Bob taught in the 75-minute session, advertised for experienced dancers.
Dancers follow the same sequence each time through. The MWSD world has a similar idea, called Progressive Squares or Exploding Squares, but the caller will vary the calls so dancers don't know what to expect. See this clip for an example.