Opera singer Sarah Brightman has revealed she is training 16 hours a day as part of her mission to perform in space.
The English-born soprano is enduring the gruelling regime, which includes four hours a day of Russian lessons, at Star City, the top space training facility in Moscow Oblast.
"It's like conducting an orchestra or performing a show," she told The Sunday Times. "It may seem a strange analogy but it's the only analogy I have.
"If you are conducting an orchestra you can't just understand a bit of it and a few notes here and there. You have to understand the whole thing from A-Z."
Failure is not an option for Brightman, who is tested once a week by Star City's top brass in a verbal exam.
"It terrifies me. I haven't been tested on things since I was a schoolgirl. To be in front of a group of people explaining what happens on a Soyuz control panel or explain the life support system alarms - it's pretty scary."
The Cats and Phantom of the Opera star said Canadian astronaut Chris Hadfield has emailed her tips on singing in space.
Hadfield became a viral sensation in 2013 after performing David Bowie's Space Oddity from the International Space Station.
She said her training as a dancer and singer left her well prepared for the physical challenges of living in space.
"I feel sort of trained for it just because of what I do in my life," she told the paper.
"People in Britain maybe don't know what I have been doing for the last 20 years, but I have had a pretty full-on career all over the world.
"That's what I do. It's gruelling but I love it. I feel designed to do it and it works. Without it, I wouldn't function that well.
"I wish we had more of a lifetime to get things done, but we have the life that we do."
Brightman is expected to take part in a tourist flight to the International Space Station later this year.
The opera star, who has sold 30 million records globally, also revealed that she once forgot she owned a flat in Manhattan.
She said: "I was staying in a hotel (in Manhattan) with a friend. We had been out to lunch and I said, 'for goodness sake, what am I doing? We're staying in a hotel and I've got an apartment here'.
"I went and got the keys from the realtor and came in and had a look...I don't spend much time in it, but when I do, it's a godsend."