WHAT The Engeman Theater opens the finale of its current all-musicals season with Rodgers and Hammerstein’s “Oklahoma!,” regarded as a breakthrough in American theater history. Before its debut in 1943, only one other Broadway musical, Jerome Kern and Hammerstein’s “Show Boat” in 1927, presented songs in the context of a well-developed story line — a concept now known as the book musical. Its 15-minute dream ballet choreographed by Agnes de Mille broke new ground, integrating dance into plot and character — in this case, Laurey, who struggles with her feelings for two suitors of opposite dispositions, Curly and Jud. At the Engeman, Laurey is played by Kaitlyn Davidson, seen on Broadway in “Rodgers and Hammerstein’s Cinderella” and “Nice Work If You Can Get It,” based on the Gershwin songbook. She’s joined by Bryant Martin, who’s played Curly in regional theaters coast to coast, and Nathaniel Hackmann, who just completed the dual “Jekyll and Hyde” title role at Engeman.

WHEN | WHERE Through June 25. Upcoming: 8 p.m. Thursday and Friday, 3 and 8 p.m. Saturday, 2 p.m. Sunday, John W. Engeman Theater at Northport, 250 Main St.

TICKETS $71-$76 (free if you buy a season subscription for 2017-18); 631-261-2900, engemantheater.org

WHAT “Life Could Be a Dream,” the jukebox doo-wop musical featuring, aside from the title tune, “Runaround Sue,” “Lonely Teardrops” and “Unchained Melody,” opens this weekend at BroadHollow Theatre Company’s BayWay Arts Center. Sh-bop, sh-boom!

WHEN | WHERE Through May 28. Upcoming: 8 p.m. Saturday, 2:30 p.m. Sunday, 2 p.m. Wednesday, BayWay Arts Center, 265 E. Main St., East Islip

TICKETS $22-$24 ($29 at the door); 631-581-2700, broadhollow.org

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WHEN Not many Brits, outside of the Rolling Stones, had discovered American blues before Savoy Brown emerged in 1965. The expat British blues band — they’ve toured the United States for much of the last half-century — went through myriad iterations. But a constant is their founder, guitarist Kim Simmonds, who doubles on vocals and harmonica. He’s joined by bassist Pete DeSalvo and drummer Garnet Grimm Friday night at the acoustically sublime Boulton Center.

WHEN | WHERE 8 p.m. Friday, YMCA Boulton Center, 37 W. Main St., Bay Shore

TICKETS $45; 631-969-1101, boultoncenter.org