After Mr. Hock came Reg Bloor, who took her position at center stage as if leading an imaginary polytonal metal band.

On Mr. Hancock’s “Cantaloupe Island,” Mr. Corea playfully challenged the rolling rhythm of its familiar vamp with syncopations and polytonal toppings of his own.

“Time” pulls together a lurching beat, a polytonal pileup of harmonies and a growled vocal that harks back to the Sly Stone of “Family Affair.”