The Roundabout’s Broadway revival of “The Mystery of Edwin Drood” celebrates both the old-time English music hall and Chita Rivera.

“On one of my first days, they paired me up with Chita Rivera,” her co-star Will Chase said following the Nov. 13 opening at Studio 54. “And one, I don’t dance, and two, Miss Rivera? I couldn’t believe it! And tonight we were talking about the original ‘Guys and Dolls’ with Michael Kidd that she was in! I’m like, ‘I’m onstage with that person.’ That’s pretty outstanding and awesome.”

Rivera takes her longevity in stride. “Oh, it’s not a mystery. It’s a blessing,” she said, preparing to leave for the Marriott Marquis’ opening-night party. “I was at the right place at the right time, there were great shows. And without John Kander, I don’t know what would have happened. How about Kander, Leonard Bernstein, Cy Coleman? That’s not a mystery, that’s a blessing.”