Prince recorded a secret treasure trove of intimate live performances, the Telegraph can reveal.

Friends and fans were banned from taking recording devices, phones or cameras into hisPaisley Park mansion for the small scale private events the singer regularly held.

But a friend said the musician himself did make recordings.

“That whole house was recorded,” the friend said. “He had it all. Nobody else has heard that stuff and it’s amazing.”

The performances included one to a handful of backing singers and dancers at which Prince serenaded Madonna while she sat cross-legged on a tiny stage.

Fans will be desperate to hear the recordings which could be worth millions of dollars. They are believed to be stored in a vault at Paisley Park, along with other unreleased material Prince produced in his studio.

His final live performance in the house was held on the Saturday before he died. A recording of it, were it ever to be released, would be of great musical significance and commercial value.

Prince performs Purple Rain during last show in AtlantaPlay!00:22

The friend, who was there, said: “We walked out of that last one and we were just like ‘Wow what happened. He was going at it but no one else ever got to hear it. He wouldn’t let nobody bring anything in to record anything but he did.”

The reclusive singer died aged 57 on Thursday morning. He was found dead in a lift in the ground floor of Paisley Park.

Police are investigating whether his use of prescription painkillers to deal with hip problems contributed to his death, but toxicology tests will not be completed for a month.