Judith Jarosz directs and Matt Castle musical-directs (and handles arrangements for the score). The staging is a chamber production with no chorus or orchestra.

No seat in the intimate Theater Ten Ten on the Upper East Side is more than 10 feet from the stage. Translation: Don't expect microphones; it's music as it was meant to be heard.

The company includes Jacquelyn Baker, Kelly Cooper, Frederick Hamilton, Greg Horton, Nicholas Mongiardo Cooper, Lisa Riegel, Morgan Sills, David Tillistrand, Ruth Weber, Cristiane Young and Sarah Zeitler.

Book and lyrics for the 1882 fairy-filled operetta (which was subtitled The Peer and the Peri) are by W.S. Gilbert, with music by Arthur Sullivan.

Designers are Caitlin McCleery (set), George Gountas (lighting) and Joanne Haas (costumes). Performances play 8 PM Monday, Friday, Saturday and 3 PM Sunday, with an additional show 7 PM May 27.

Iolanthe is part of Theater Ten Ten's 50th Anniversary Season. The troupe bills itself as New York City's longest continuously-operating Equity theatre company. Performances play 1010 Park Avenue, in the Park Avenue Christian Church Building, between 84th and 85th Streets.

Tickets are $19. For information, call (212) 288-3246, ext. 3.