Fans of the 1992 “Sister Act” movie starring Whoopi Goldberg will find that the touring musical coming to the Opera House this week moves to a different beat. Out with the Motown pastiche, in with the disco.

Rock and soul have fluid, syncopated rhythms, says the stage adaptation’s composer, Alan Menken. With disco, though, “all of a sudden it was just: Boom. Boom. Boom. On the beat,” he says. “I found the ’70s music in general to be something that just tickled me. It was so dance-oriented. It was the underscore for a whole other kind of culture.”