And (at separate times on those two stages) Ms. Weber and Mr. Mitchell each dance slightly different versions of the long solo made for Lisa Fox (who died in August) in "Fractions I" (1977).
"We've taken ballroom dancing to another level," said Harley Medcalf, the show's Australian-born creator and producer, whose inspiration came from the entertainment that Mr. John gave the 600 guests at his birthday party: a swirl of couples performing traditional and Latin ballroom dances, slightly stylized.
Jared Angle (in purple) danced with his distinctive, slightly dark dreaminess.
As the most physically brilliant ballerina of her generation she used to dance from a slightly dead centre, but in Two she is radiant.
A cheer went up in the room, and "Dancing in the Street" began blaring, as supporters in the bleachers didn't quite dance, but swayed slightly as they shook American flags and red-white-and-blue pom-poms.
Her alternate, Tatyana Amosova, danced in the brassy and slightly vulgar style with which we are much more familiar.
It was like a potted survey of Korean dance, and slightly didactic as such.
The dances became slightly more acrobatic, with kneeling dips and twirls.
But Judson's Romanesque architecture, warmly lighted by David Moodey, is a fine container for Ms. Fenley's ceaseless, stylized movement eddies, which conjure courtly dances by slightly wild-minded muses.
The atmosphere in the rehearsal studio, where they are preparing for their mammoth 30-date UK tour, is bright, with all three visibly enjoying the run-throughs of their vocals (very impressive) and dance steps (slightly less so).
