Zorongo Flamenco Dance Theater, Katha Dance Theater and Flying Foot Forum are Twin Cities Dance Companies with close connections with music. These companies combine forces on Thursday May 8 and many other dates through May 18 at the Andy Boss Thrust Stage at Park Square Theater in Saint Paul, from 7:30 till 10pm. The performance is called Time Piece. Phil Nusbaum had the opportunity for a visit to a rehearsal of Joe Chvala and Karla Grotting of Flying Foot Forum.