The rock producer thinks “computerised voices” have ruined pop music.

Tony Visconti, the producer best known for his work with David Bowie, has said that Adele’s “great voice” could have been “manipulated”.

“You turn the radio on and it’s fluff, you are listening to 90% computerised voices,” the 72-year-old told the Daily Star. “We know Adele has a great voice but it’s even questionable if that is actually her voice or how much has been manipulated. We don’t know.”

He added: “There’s a sound to pop now that is so perfect it’s boring, because everything is fixed.”

Visconti’s comments came as he was promoting his appearance on the new series of TV talent show Guitar Star. “I’m looking for virtuosos like Hendrix, Cobain and Bowie,” he added. “There’s no fluffy back story, there’s no: ‘I lost my pet dog in ‘97 and that made me want to play’ nonsense.”

But the famed producer apparently doesn’t mind singers faking it a bit if they want to sound more like Bowie – he’s been working with audio software company Eventide to build a plug-in that mimics the microphone techniques used on “Heroes”.

Last week Visconti also promised more “great” unreleased Bowie music on the way, including five songs recorded for a potential follow-up to his final album Blackstar.

Adele is set to headline Glastonbury this month, and anyone who moans about it is “fucking boring”.