Pink Floyd fans claim that if you synchronize the 1939 film "The Wizard of Oz" with the band's 1973 album "Dark Side of the Moon," there's an eerie similarity between the two. Some believe the British band wrote the album to correspond with the film, while Pink Floyd has always stated that the idea is preposterous.

But Wednesday, tapping the independent spirit of the Sundance Film Festival, Salt Lake City musician Eliza Wren will perform her own musical soundtrack to the classic film's 1985 sequel, "Return to Oz." Wren, a guitar player who leads the band Haun's Mill, will perform 110 minutes of original music corresponding to every scene in the dark film.

The movie will be shown with the volume turned down, with Wren performing her alternative score, with live and taped sections, at the O.C. Tanner jewelry store at 416 Main St. in Park City.

Before you call Wren preposterous, consider this: Fairuza Balk, who portrayed Dorothy in the 1985 film and who has subsequently become an established actress in films such as "Almost Famous," "American History X" and "The Waterboy," will be on hand to introduce the screening and watch Wren's interpretation.

"I'm surprised how much of a cult film it has become," Balk said in a Tribune interview. "It was a very special part of my life, and it means a lot to a lot of people. Because of the movie, that's why I have a career."

Most of the time, Wren said, she can only tolerate a movie once, but has always loved "Return to Oz" -- and claims to have seen it more than 1,000 times. "I liked it as a kid," Wren said. "It was a horror film for kids."

But why compose 110 minutes of music to a 24-year-old film? "I guess it's kind of the same reason a mom goes through the trouble to give birth to a child," the musicians said. "It was something I created and believed in and I wouldn't feel right not going through with it. I feel it deserves the blood, sweat and tears I've put into it. And as far as the film's date, I feel this is a pretty timeless film -- [it] doesn't seem to be dated -- and is better than many current fantasy films."

After spending three years, off and on, writing the alternate score, Wren contacted Balk's agent. Surprisingly, the 34-year-old actor didn't find Wren's idea preposterous; instead, the actor agreed to come to Park City this week for the sole purpose of watching Wren's music performed with the screening of the film.

"I'm a big supporter of musicians and up-and-comers," Balk said. "She seems like an interesting gal."

Interesting, yes. Preposterous ... maybe. You be the judge.