Prince was still performing as recently as last week
The hugely popular and acclaimed musician Prince has died at his home in Minnesota at the age of 57, his publicist has said.
Police were called to a medical emergency at his Paisley Park estate earlier on Thursday, US media reported. An investigation is underway.
Prince became a global superstar in the 1980s, with albums such as 1999, Purple Rain and Sign O' the Times.
He sold more than 100 million records during his career.
Born Prince Rogers Nelson in 1958 he was a prolific writer and performer from a young age.
A singer, songwriter, arranger and multi-instrumentalist, Prince recorded more than 30 albums. His best known hits include Let's Go Crazy and When Doves Cry.
He also built a reputation for secrecy and eccentricity, once changing his name to an unpronounceable symbol.
In 2004, Prince was inducted into the Rock and Roll Hall of Fame, which said he "rewrote the rulebook".
Last week he was rushed to hospital hours after performing on stage, but was soon released.
Tributes have been pouring in on social media and fans have been gathering at Paisley Park.
Chic guitarist Nile Rogers said there were "tears and love on our tour bus". Pop star Katy Perry said "the world lost a lot of magic". Director Spike Lee said: "I Miss My Brother. Prince Was A Funny Cat. Great Sense Of Humour."
Prince was in his element as a live performer, like here at the 2007 Super Bowl
A musical prodigy from a broken home, Prince famously wrote, arranged, produced and played almost all of his hit records.
But the Purple man's purple patch really came with his first band The Revolution.
With them by his side, he wrote more than two dozen rock classics in a five-year flurry.
Purple Rain, Little Red Corvette, 1999, Raspberry Beret, When Doves Cry, Kiss... At the same time, he dashed off Manic Monday for The Bangles and Nothing Compares 2U, made famous by Sinead O'Connor.
In the studio, he was unstoppable. But the magic really happened on stage. He would vamp, preen and tease and audience into a frenzy, then slay them with a quiet moment of crystalline beauty. He was a joy to watch.