Sarah Brightman is on a mission to find the perfect song to sing in space.
Brightman, 54, is working with her former husband Andrew Lloyd Webber to find a song that "suits the idea of space".
"I'm trying to find a piece that is beautiful and simple in its message", she told an audience at a press conference in central London on Tuesday.
"I would like to connect with a choir, or children or another singer or an orchestra on Earth," she continued.
The Phantom of the Opera star revealed that she had been training for 15-16 hours a day at Star City near Moscow, and is set for take off on a Russian Soyuz craft on September 1.
"To sing in microgravity is a very different thing to singing down here," she said. "We use the Earth to ground ourselves when we sing and the air around us.
"This is going to be very different. I'm trying to find a piece that is beautiful and simple in its message, as well as not complicated to sing."
Brightman will become the first professional singer to reach the International Space Station, but not the first person to sing in space.
Last year astronaut Chris Hadfield's rendition of David Bowie's Space Oddity from the ISS became a huge YouTube hit.
