By Stephen M. Silverman
Updated August 10, 1998 12:00 AM

Recently they made fun of the 1965 Hollywood classic “The Sound of Music” by staging sing-alongs to the movie, in which audience participants dress up as such characters from the flick as nuns and wild geese that fly with a moon on their wings (a la midnight showings of “The Rocky Horror Picture Show”). Now, the Brits are having a go at “The Simpsons” — yes, Homer, Marge, Bart, et al. — by staging live theatrical script readings in London of the hit animated Fox series, starring original cast members of the TV show. The Simpson stage shows, which are sold out, will be held tonight and tomorrow. “We all have a little bit of Bart inside us,” Nancy Cartwright, who renders Bart’s voice, said at a news conference yesterday. As for the live show, Harry Shearer (the voices of Mr. Burns and Smithers), told Reuters, “The best thing is to see and feel the excitement of the audience.” One final (musical) note: “The Sound of Music Sing-Along,” as it is called, will land on American shores in early September, at New York’s cavernous Ziegfeld Theater, the Rodgers and Hammerstein office has told Original cast members from the movie are due to attend. No word yet on their costumes.