Long Island summer theater opens next month with a blockbuster rock musical and a world premiere political/romantic comedy followed up in July with a Noel Coward-inspired farce.

That covers each of the Island's three Actors Equity companies hiring union-scale players and crews. Here's what's playing when and where:

THE GATEWAY

First up is "Rock of Ages," the glam-metal musical that closed in January at the Helen Hayes Theatre after more than 2,300 Broadway performances, spawned productions from the U.K. to Australia and may run forever at The Venetian in Las Vegas. Featuring 1980s hits by Journey, Bon Jovi, Pat Benatar, Twisted Sister, Steve Perry, Styx and other metal favorites, "Rock of Ages" opens May 20 and runs through June 6 in Bellport.

"Nice Work If You Can Get It," the Tony-winning revue of timeless George and Ira Gershwin songs -- others include "Let's Call the Whole Thing Off" and "Someone to Watch Over Me" -- plays from June 10 to 27. "Sister Act," the musical based on the 1992 film starring Whoopi Goldberg, gets back into the habit July 1-18.

Gateway moves to the larger Patchogue Theatre July 22-Aug. 8 to accommodate the 2009 winner of 10 Tonys, "Billy Elliot," a dramatic dance musical with tunes by Elton John. It's back to Bellport Aug. 26-Sept. 12 for the summer finale, "Saturday Night Fever," the classic disco musical featuring the Bee Gees' "Stayin' Alive."

In a special event, "Dancing With the Stars" celebrities join "American Idol" and "So You Think You Can Dance" finalists in "Ballroom With a Twist," Aug. 12-16 in Patchogue.

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WHERE 215 South Country Rd., Bellport. Some shows at Patchogue Theatre, 71 E. Main St.

TICKETS $54-$89, discounts of $5, $10 and $15 for three, four, five or more shows; 631-286-1133, gatewayplayhouse.org

BAY STREET THEATER

Bob Balaban directs the world premiere of "The New Sincerity," a comedy by Alena Smith on Sag Harbor's Bay Street stage May 26-June 14. Balancing politics, love and career ambitions while maintaining a high social-media profile proves tricky for a young journalist involved in a triangle with two rowdy activists. Meanwhile, Jason Alexander was to star in "Other People's Money," the 1989 play about a Wall Street corporate raider, June 23 to July 26. But he announced that he was withdrawing to take over for Larry David in his Broadway comedy, "Fish in the Dark." The musical "Grey Gardens," set at an oceanfront mansion just down the road in East Hampton, winds up the season Aug. 4-30. It's the based-on-fact story of Edith Beale and her daughter, also Edith, who go from glamour to squalor until their embarrassed niece/cousin, the former Jacqueline Bouvier, rescues the house from condemnation.

WHERE Long Wharf, Sag Harbor

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TICKETS $25-$89 per show; 631-725-9500, baystreet.org

ENGEMAN THEATER

The Engeman, Long Island's only year-round Equity theater, opens its 2015-16 season with "The Cottage," a Roaring '20s farce set in the English countryside. Replete with sex, betrayal, more sex and possibly even love, the play runs from July 23 to Sept. 6, Next, it's the Bernstein-Sondheim classic "West Side Story" Sept. 17-Nov. 1 and the holiday musical, "Miracle on 34th Street," Nov. 19-Jan. 3. In 2016, the wicked comedy of bad manners "God of Carnage" displays frayed tempers Jan. 21-March 6, followed by the musicals "Memphis" (March 24-May 8) and "Thoroughly Modern Millie" (May 26-July 10).

Meanwhile, the current Engeman season continues with "A Chorus Line" 8 p.m. Friday and next Thursday, 3 and 8 p.m. Saturday, 2 p.m. Sundays, through May 10, and "The Producers" May 28-July 12.

WHERE 250 Main St., Northport

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TICKETS $69 for musicals (including "A Chorus Line" this weekend), $59 for plays; 631-261-2900, engemantheater.com