Following the daylight of an extended, much-talked-about spring engagement at Off-Broadway's Playwrights Horizons, the award-winning musical by Doug Wright (book), Scott Frankel (music) and Michael Korie (lyrics) now basks on Broadway, where, among other refinements, it will get a larger and more elegantly automated physical production.

Inspired by their success Off-Broadway, the writers and director Michael Greif have continued shaping the project toward its Broadway run. Fans of the score (heard on a recent cast album of the Off-Broadway production) will find new discoveries in the music and lyrics this fall.

The musical about dashed dreams of two Long Island society women — whose stroll through the American dream includes emotional poison ivy — earned rapturous reviews and a handful of awards for Christine Ebersole, who played dual roles in the show. She's back, and conventional wisdom is that the 2007 Best Actress (Musical) Tony Award is all hers, unless a wind from the east rattles the branches of Grey Gardens.

Erin Davie makes her Broadway debut as young socialite Edie Beale in the new American musical. Davie, who appeared in the national tours of Swing! and The Music of Andrew Lloyd Webber, will be central to the stylish first act of Grey Gardens.

Set in 1941, Act One act shows a momentous day in the life of Young "Little" Edie Beale, who is about to start of a future with young Joe Kennedy, Jr. In the first half of Grey Gardens, Christine Ebersole plays Little Edie's vivacious, controlling, spotlight-hungry mother, Edith Bouvier Beale. By Act Two, it's 1973 and their lives at the family's ramshackle Long Island mansion, Grey Gardens, have deteriorated.

By then, Ebersole assumes the part of late-middle-aged Little Edie, and Mary Louise Wilson plays the haggard Edith — alone together and haunted by the past.

The performances were hailed for their faithfulness to the quirks and voicing of the real-life women, whose eccentricities were captured in the documentary film of the same name.

"The events of the play," according to the earlier Off-Broadway Playbill note for the musical, "are based on both fact and fiction."

The musical is inspired by the 1975 documentary film "Grey Gardens." The picture remains a creepy account of mental, physical and social decline.

Here's how the producers characterize the show: "Grey Gardens brings to life both the delightfully eccentric aunt and cousin of Jacqueline Kennedy Onassis. Once among the brightest names in the pre-Camelot social register, these two women became East Hampton's most notorious recluses, living in a dilapidated 28-room mansion. Set in two eras — in 1941 when the estate was in its prime and in 1973 when it was reduced to squalor — the musical tells the alternately hilarious and heartbreaking story of two indomitable individuals, Edith Bouvier Beale and her adult daughter 'Little' Edie."

For the musical, librettist Wright borrows lines from the documentary to pepper an imagined Act One that has the whiff of Cole Porter's "High Society" to it. Act Two is set in the crumbling East Hampton home and more closely follows the documentary (including the more memorable lines from the ladies), spiked with songs, such as Frankel and Korie's haunting "Another Winter in a Summer Town."

Repeating their performances from last spring's Playwrights Horizons production will be five-time Tony Award nominee John McMartin (Follies, Show Boat, Into the Woods) as Major Bouvier; two-time Tony Award nominee Bob Stillman (Dirty Blonde, Grand Hotel) as Gould; Matt Cavenaugh (Urban Cowboy, national tour of Thoroughly Modern Millie) as both Joe Kennedy, Jr. and Jerry; Obie Award winner Michael Potts (Lennon) as Brooks; and Sarah Hyland (title role in Paper Mill Playhouse's Annie) as Young Jacqueline Bouvier.

Joining the company will be nine-year-old Kelsey Fowler as Young Lee Bouvier. Audrey Twitchell, the young actress who created the part earlier this year, has outgrown it, physically. For the record, Sara Gettelfinger (Nine, Dirty Rotten Scoundrels) created the role of Young Little Edie Off-Broadway and is heard on the world premiere recording from PS Classics.

Producers of the Broadway production are East of Doheny, Staunch Entertainment, Randall L. Wreghitt/Mort Swinsky, Michael Alden and Edwin W. Schloss, in association with Playwrights Horizons.

Based on the cult-hit 1975 documentary "Grey Gardens" by David Maysles, Albert Maysles, Ellen Hovde, Muffie Meyer & Susan Froemke (a Maysles Brothers Films Inc. Production), the musical is directed by Michael Greif (Rent) and features musical staging by Tony Award nominee Jeff Calhoun (Big River, Grease!).

The Broadway production reunites the original creative and design team, featuring scenic design by Allen Moyer, costume design by five-time Tony Award winner William Ivey Long, lighting design by Tony Award winner Peter Kaczorowski, sound design by Brian Ronan and projections by Wendall K. Harrington. Orchestrations are by Tony Award winner Bruce Coughlin and music director is Lawrence Yurman.

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The musical Grey Gardens is part of a flood of renewed interest in the Beales. There is a new Maysles Brothers companion movie, "The Beales of Grey Gardens" (featuring previously-unseen outtakes from the original documentary), several upcoming books (including a collection of Edie's original poetry) and a future Hollywood feature based on the documentary, which is now in pre-production.

Grey Gardens had its world premiere at Playwrights Horizons, opening March 7, 2006 and completely sold out its initial limited engagement as well as three extensions. The musical was named Outstanding Off-Broadway Musical by the Outer Critics Circle Awards and was also the winner of a 2006 Richard Rodgers Production Award, administered by the American Academy of Arts and Letters.

It was most recently honored by the theatre annual Best Plays as one of the 10 best of the 2005-2006 season, and the only musical cited.

For her work in Grey Gardens in spring 2006, Ebersole won a Drama Desk Award, an Outer Critics Circle Award, an Obie, a special citation from the New York Drama Critics Circle and the Drama League's 2006 Distinguished Performance of the Year Award.

Wilson earned Drama Desk, Outer Critics Circle and Lortel nominations and has been honored by the Drama League for her performance.

The world premiere recording, featuring the Off-Broadway cast, has just been released on PS Classics. For more information, visit www.psclassics.com.

Tony Award winner and Pulitzer Prize winner Doug Wright (I Am My Own Wife) also penned the play Quills and the screenplay for its film version. Composer Frankel was musical director for Broadway's Falsettos and Putting It Together and lyricist Michael Korie co-wrote the opera Harvey Milk and lyrics for the Broadway-aimed Lucy Simon musical Zhivago.

Tickets ($86.25-$111.25) are available by visiting www.telecharge.com or calling (212) 239-4200. The Walter Kerr Theatre is at 219 W. 48th Street.

Balcony seats ($36.25) will only be available in person at the box office.

For additional information, visit www.greygardensthemusical.com.