NEW YORK (AP) — The Alvin Ailey American Dance Theatre has launched a season-long celebration of Revelations, its masterpiece, first performed 50 years ago in a one-night show at a Manhattan community centre.

And you could see the joy on the faces of the Ailey dancers — the ones who make sure it stays fresh, alive and the most beloved work of modern dance in the world.

Joy, perhaps mixed with a bit of nervousness. The piece is usually performed to taped music, but at Wednesday’s City Centre gala, its famous spirituals were performed live by Sweet Honey in the Rock, the Grammy-winning, all-female ensemble. The presence of live accompaniment was exciting and fresh, but also probably a bit unnerving for the dancers, especially at moments when the tempo or key seemed to waver from the norm.

Yet Revelations could be performed in a driving snowstorm and still transmit its power, beauty, cultural resonance and infectious energy. It was especially moving to see a new short film explaining the social context of the work — which chronicles the African-American experience through such songs as I Been ‘Buked, Fix Me, Jesus, Wade in the Water and the joyous, rollicking Rocka My Soul in the Bosom of Abraham — and showing Ailey himself dancing it, muscles rippling, his very intensity seeming to jump off the screen.

This Ailey season is important for another reason than the Revelations birthday: It is the last for Judith Jamison, the artistic director who took over after Ailey’s death in 1989. This iconic dancer, who made her mark in Ailey’s searing Cry, was honoured at the White House earlier this year and will be the subject of a final farewell show on January 2. (After that, the Revelations 50th birthday tour hits the heartland, covering 24 cities by late May.)

Wednesday’s gala was also an opportunity to present Jamison’s successor: choreographer Robert Battle, who promptly charmed the audience. Opinions were a bit more varied on The Hunt, his own 2001 work that had its Ailey premiere.

A piece for six men, bare-chested and in long black skirts, it effectively showcased the athleticism of some of the company’s most accomplished male dancers, including the wonderful Matthew Rushing. They leaped and turned to the rhythms of Les Tambous du Bronx, a French percussion group, and while their movements were absorbing, one wished they had built to something more climactic.

The evening also honoured Joan Weill, the chairwoman of the Ailey board who has both given and raised millions for the company over a decade. She was the first to stand and cheer Revelations at its conclusion, a gesture that the rest of the audience soon followed, and which crowds across the globe are sure to do for another 50 years, at least.