Prince performs on the Isle of Amager in Copenhagen, Denmark in a concert that was interrupted by heavy rain in August 2011. (Polfoto/Jakob Joergensen/AP Photo)
Prince and his band were the surprise musical guest during the George Lucas and Mellody Hobson's wedding reception in Chicago in June 2013. (Barry Brecheisen/Invision/AP)
Prince speaks onstage during the 2015 American Music Awards at Microsoft Theater on November 22, 2015 in Los Angeles, California. (Kevin Winter/Getty Images)
Prince in concert at the Oracle Arena in Oakland, Calif. on March 4, 2016. (victorey/Instagram)
Prince, center, smiles as he watches an NBA basketball game between the Golden State Warriors and the Oklahoma City Thunder on March 3, 2016, in Oakland, Calif. (Marcio Jose Sanchez/AP Photo)
Prince accepts the Lifetime Achievement Award from Chaka Khan at the BET Awards in June 2010 in Los Angeles. (Matt Sayles/AP Photo)
Prince is seen before the presentation of Chanel's ready-to-wear fashion collection in Oct. 2009 in Paris. (Christophe Ena/AP Photo)
Prince performs during the halftime show at Super Bowl XLI at Dolphin Stadium in Miami in Feb. 2007. (Alex Brandon, File/AP Photo)
Prince plays a guitar shaped in the symbol used to represent him in his 2007 Super Bowl halftime performance. (Chris O'Meara, File/AP Photo)
Prince chats with actress Penelope Cruz in Feb. 2007 in Beverly Hills, Calif. (Mark J. Terrill/AP Photo)
Prince, left, performs with Chaka Khan during the 6th annual BET Awards on Tuesday, June 27, 2006, in Los Angeles. (Chris Carlson/AP Photo)
Prince performs on stage with singer Tamar during ABC's ''Good Morning America'' summer concert series in New York in June 2006. (Jeff Christensen/AP Photo)
Prince arrives with his wife Manuela Testolini for the 77th Academy Awards in Feb. 2005, in Los Angeles. (Kevork Djansezian/AP Photo)
Prince performs during the 46th Annual Grammy Awards in Los Angeles in Feb. 2004. (Kevork Djansezian, File/AP Photo)
Prince performs in Hong Kong Friday, Oct. 17, 2003. (Anat Givon/AP Photo)
Britain's Prince Charles talks with The Artist, formerly known as Prince, left, and his wife Mayte Garcia at the "Diamonds are Forever" celebration in London in June 1999. (Dave Hogan/pool/AP Photo)
The Artist, formerly known as Prince, speaks at GQ magazine's third annual Men of the Year Awards in New York in Oct.1998. (Mitch Jacobson/AP Photo)
The Artist, formerly known as Prince, performs at the Festhalle in Frankfurt, Germany during a tour in Dec. 1998. (Bernd Kammerer/AP Photo)
Boxing great Muhammad Ali, right, embraces the Artist Formerly Known as Prince, before the pair announced a benefit concert in 1997. (Karin Cooper/Rogers & Cowan/AP Photo)
Prince is surrounded by dozens of singers performing ''We Are The World'' for the 10th anniversary of the African famine relief anthem at the 1995 American Music Awards. (Reed Saxon/AP Photo)
The artist formerly known as Prince performs with Mayte and other dancers during the VH1 Fashion & Music Awards show in New York Sunday, Dec. 3, 1995. (Adam Nadel/AP Photo)
Prince pauses during his show at New York's Madison Square Garden Sunday night, Oct. 3, 1988. (Ed Bailey/AP Photo)
Prince speaks at the American Music Awards in Jan. 1986 in Los Angeles. (Nick Ut/AP Photo)
Rock singer Prince performs at the Orange Bowl during his Purple Rain tour in Miami, Fla., April 7, 1985. (Phil Sandlin/AP Photo)
Prince performs at the 1985 Grammy Awards at the Shrine Auditorium in Los Angeles, Feb. 26, 1985. (AP Photo)
Prince performs during the 27th annual Grammy Awards at the Shrine Auditorium in Los Angeles, in Feb. 1985. (Liu Heung-Shing/AP Photo)
Rock singer Prince points skyward during his performance at the Orange Bowl in Miami, Fla., April 7, 1985. (Phil Sandlin/AP Photo)
Prince accepting the Academy Award for Best Original Song Score for "Purple Rain" in 1985. (Courtesy of AMPAS)
Prince accepting the Academy Award for Best Original Song Score for "Purple Rain" in 1985. (Courtesy of AMPAS)
Prince accepting the Academy Award for Best Original Song Score for "Purple Rain" in 1985. (Courtesy of AMPAS)
Rock singer Prince performs at the Forum in Inglewood, Calif., during his opening show, Feb. 18, 1985. (Liu Heung Shing/AP Photo)