Pink Floyd bassist Roger Waters has completed his first opera after 16 years in the making.
Roger Waters left Pink Floyd in the 1980s
Ca Ira - which features Welsh baritone Bryn Terfel and other classical music stars - is an "operatic history of the French Revolution".
It is due to be released on CD in September and will be performed in concert in Rome later this year.
Pink Floyd, whose first album was released in 1967, recently reunited on stage at the Live 8 concert in London.
Waters, 61, began working on Ca Ira in 1989 when songwriter Etienne Roda-Gil approached Waters with his libretto, which was illustrated by Roda-Gil's wife Nadine.
"He wanted to know if he could use my old songs.
"I looked at it and sort of fell in love with it... after six weeks I had a demo that was over two hours long."
The project was put on hold when Nadine Roda-Gil died of leukaemia, but Waters and her husband eventually began working together again.
Waters joined his former Pink Floyd band members at Live 8
Waters wrote both the French and English versions.
Ca Ira will be performed in concert in Rome later this year, but Waters said his aim was to have it performed by an opera company.
He said he was nervous about the reaction from the classical music world.
"I'm in some state of trepidation because I feel that I'm putting my head on the chopping block," he said.
"It's actually very melodic and it's unashamedly emotional. So, if the intellectuals of the modern opera world are catty about it, so be it.
"I fully expect some resistance. There will be a lot of, 'Who does he think he is?"