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FILE - This 1991 file photo shows the band Nirvana, from left, Krist Novoselic, Dave Grohl, and Kurt Cobain. Nirvana will be inducted into the 2014 Rock and Roll Hall of Fame on April 10, 2014, at the Barclays Center in New York. (AP Photo/Chris Cuffaro, File) ( Music Rock Hall )

FILE-- File picture of Kurt Cobain, former singer and songwriter of the Seattle band "Nirvana" (AP Photo/Robert Sorbo) ( KURT COBAIN )

American singer and guitarist Kurt Cobain (1967 - 1994), performs with his group Nirvana at a taping of the television program 'MTV Unplugged,' New York, New York, Novemeber 18, 1993. (Photo by Frank Micelotta/Getty Images) ( T681266_14 )

An undated file photo shows "Nirvana" lead singer and guitarist Kurt Cobain performing on stage. Cobain committed suicide at his home in Seattle on April 5, 1994. (AP Photo)

This 21 May, 2001 file photo shows US actress/musician Courtney Love (L) pointing to a photographer as she arrives with her daughter Frances (R) for the world premiere of the movie "Pearl Harbor" on the deck of the US Navy aircraft carrier USS John C. Stennis in Pearl Harbor, Hawaii. (MIKE NELSON/AFP/Getty Images) ( WAS2003110719127 )

This photo taken on April 1, 2014 shows the house in Seattle, Washington, where Nirvana frontman Kurt Cobain committed suicide. (Michael THURSTON/AFP/Getty Images) ( Was8478155 )

This April 1994 photo provided by the Seattle Police Department shows items found at the scene of Kurt Cobain's suicide, in Seattle. The image has never before been released. Police spokeswoman Renee Witt said Thursday, March 20, 2014, that several rolls of undeveloped film were found when a detective re-examined the Cobain case recently. (AP Photo/Seattle Police Department) ( Kurt Cobain Investigation )

A sign in Kurt Cobain Park in Aberdeen, Washington on April 1, 2014. The park where Cobain used to hang out and write songs has become a symbol for fans as it was a gathering place after the news of his death spread. Nirvana fans prepare to mark the 20th anniversary of the iconic frontmans suicide on April 5. (Sebastian VUAGNAT/AFP/Getty Images) ( Was8477270 )

FILE - This Dec. 13, 1993 file photo shows Kurt Cobain of the Seattle band Nirvana performing in Seattle, Wash. (AP Photo/Robert Sorbo, File) ( Kurt Cobain Anniversary )

This April 1994 photo provided by the Seattle Police Department shows items found at the scene of Kurt Cobain's suicide, in Seattle. The image has never before been released. Police spokeswoman Renee Witt said Thursday, March 20, 2014, that several rolls of undeveloped film were found when a detective re-examined the Cobain case recently. (AP Photo/Seattle Police Department) ( Kurt Cobain Investigation )

Kurt Cobain lives on in a DVD. (AP Photo/Sam Morris)

Kurt Cobain of Nirvana during the taping of MTV Unplugged at Sony Studios in New York City, 11/18/93. Photo by Frank Micelotta. ( id_kurt_21.jpg )

Kurt Cobain, front man of the rock group Nirvana, is shown during a benefit concert at the Cow Palace in Daly City, Calif., April 9, 1993. (AP Photo/Sam Morris) ( NIRVANA SHOW KURT COBAIN )

Rock singer Kurt Cobain (1967 - 1994) performs on stage with Nirvana at the MTV Video Music Awards, September 10, 1992. (Photo by Frank Micelotta/Getty Images) ( T750376_01 )

American singer and guitarist Kurt Cobain (1967 - 1994), performs with his group Nirvana at a taping of the television program 'MTV Unplugged,' New York, New York, Novemeber 18, 1993. (Photo by Frank Micelotta/Getty Images) ( T681266_04 )

The welcome sign to Aberdeen, Washington, is seen on April 1, 2014 along with the title of a Nirvana song. Nirvana fans prepare to mark the 20th anniversary of the band's frontman Kurt Cobain's suicide on April 5. (Michael THURSTON/AFP/Getty Images) ( Was8478154 )

Members of the band Nirvana shown in a 1991 file photo are (from left) Krist Novoselic, David Grohl, and Kurt Cobain. Novoselic recently sat down with former (Aberdeen) Daily World Publisher and Editor John Hughes for an oral history, which was released Feb. 24, 2009 by the Washington secretary of state's Legacy Project. Novoselic said fans should not expect any more Nirvana songs to be released. (AP Photo/Chris Cuffaro, File)

A sign in Kurt Cobain Park in Aberdeen, Washington on April 1, 2014. The park where Cobain used to hang out and write songs has become a symbol for fans as it was a gathering place after the news of his death spread. Nirvana fans prepare to mark the 20th anniversary of the iconic frontmans suicide on April 5. (Sebastian VUAGNAT/AFP/Getty Images) ( Was8477267 )

Lead singer of Nirvana Kurt Cobain is shown in a 1993 file photo. Cobain, who raked in a posthumous $50 million between October 2005 and October of this year, has edged Elvis Presley from the No. 1 spot on Forbes magazine's annual list of "Top-Earning Dead Celebrities." He committed suicide in 1994.(AP Photo/Mark J.Terrill)

Graffiti seen under a bridge in Kurt Cobain Park in Aberdeen, Washington on April 1, 2014. The park and bridge where Cobain used to hang out and write songs has become a symbol for fans as it was a gathering place after the news of his death spread. Nirvana fans prepare to mark the 20th anniversary of the iconic frontmans suicide on April 5. (Sebastian VUAGNAT/AFP/Getty Images) ( Was8477281 )

Singer Courtney Love and her daughter Frances Bean Cobain pose as they arrive, Thursday, Feb. 8, 2007, in Beverly Hills, Calif. where the City of Beverly Hills and the Rodeo Drive Committee honored Gianni Versace and his sister Donatella Versace for their contributions to the worlds of fashion and entertainment with the Rodeo Drive Walk of Style Award. Versace, founded in 1978 by Gianni Versace, is one of the leading international fashion design houses and a symbol of Italian luxury worldwide. (AP Photo/Mark J. Terrill)

The family home of musician Kurt Cobain is seen in Aberdeen, Washington on April 1, 2014. Nirvana fans prepare to mark the 20th anniversary of the iconic frontmans suicide on April 5. (Sebastian VUAGNAT/AFP/Getty Images) ( Was8477284 )

A memorial plaque sits in the ground at Kurt Cobain Riverfront Park in Aberdeen, Wash. on Friday, Aug. 7, 2009. The granite plaque stirred controversy because of an obscenity in a quote by Cobain etched into the memorial. The last three letters of the word were removed Thursday and replaced with dashes before the Aberdeen City Council could weigh in on the issue. (AP Photo/The Daily World, Dan Jackson)

A Nirvana Ovation acoustic guitar played by Kurt Cobain is displayed at the launch of Hard Rock International's traveling music memorabilia collection, "Gone Too Soon," Wednesday, Feb. 13, 2013, at Hard Rock Cafe New York. "Gone Too Soon" pays tribute to music icons whose lives and career where tragically cut short and will be on tour at Hard Rock locations in the U.S. throughout 2013. (Photo by Diane Bondareff/Invision for Hard Rock International/AP Images)

The carriage house in Seattle where grunge rock star Kurt Cobain shot himself in 1994, shown June 4, 1996. (AP Photo/Seattle Post-Intelligencer, Phil Webber)

City of Aberdeen, Wash., workers level ground on the site of a new park along the banks of the Wishkah River near the Young Street Bridge. Tory Kovach and Denny Jackson are building a park there in memory of Kurt Cobain. The Young Street Bridge has turned into an unofficial memorial to the Aberdeen grunge rock star since his suicide in 1994.(AP Photo/The Daily World, Dan Jackson)

A painting by late Nirvana frontman Kurt Cobain in Tacoma, Wash. (AP Photo)

Graffiti seen on a bench in Kurt Cobain Park in Aberdeen, Washington on April 1, 2014. The bench and park, where Cobain used to hang out, have become a symbol for fans as it was a gathering place after the news of his death spread. Nirvana fans prepare to mark the 20th anniversary of the iconic frontmans suicide on April 5. (Sebastian VUAGNAT/AFP/Getty Images) ( Was8477264 )

A painting by late Nirvana frontman Kurt Cobain is shown in Tacoma, Wash. (AP Photo)

Gillian Gaar, author the book " The Rise of Nirvana" sits on a bench in Kurt Cobain Park in Washington on April 1, 2014, adjacent to the house where Cobain lived (background). The bench has become a symbol for fans as it was a gathering place after the news of his death spread. Nirvana fans prepare to mark the 20th anniversary of the iconic frontmans suicide on April 5. (Sebastian VUAGNAT/AFP/Getty Images) ( Was8477288 )

A painting by late Nirvana frontman Kurt Cobain is shown in Tacoma, Wash. (AP Photo)

A painting by late Nirvana frontman Kurt Cobain is shown in Tacoma, Wash. (AP Photo)

A painting by late Nirvana frontman Kurt Cobain was done on the back of a board game that Cobain bought at thrift store because he was too poor to afford canvas, is seen April 1, 2004, in Tacoma, Wash. The crease from the folding board is clearly visible across the center of the painting. (AP Photo)

Enslow Publishers provided this photo of the cover of `Kurt Cobain: Oh Well, Whatever, Nevermind.' (AP Photo/Enslow Publishers)

A sign in Kurt Cobain Park in Aberdeen, Washington on April 1, 2014. The park where Cobain used to hang out and write songs has become a symbol for fans as it was a gathering place after the news of his death spread. Nirvana fans prepare to mark the 20th anniversary of the iconic frontmans suicide on April 5. (Sebastian VUAGNAT/AFP/Getty Images) ( Was8477268 )

The family home of musician Kurt Cobain is seen in Aberdeen, Washington on April 1, 2014. Nirvana fans prepare to mark the 20th anniversary of the iconic frontmans suicide on April 5. (Sebastian VUAGNAT/AFP/Getty Images) ( Was8477283 )

Graffiti etched in a bench in Kurt Cobain Park in Aberdeen, Washington on April 1, 2014. The bench and park, where Cobain used to hang out, have become a symbol for fans as it was a gathering place after the news of his death spread. Nirvana fans prepare to mark the 20th anniversary of the iconic frontmans suicide on April 5. (Sebastian VUAGNAT/AFP/Getty Images) ( Was8477290 )

This undated photo provided by Kim Cobain shows a young Kurt Cobain in his childhood home in Aberdeen, Wash. (AP Photo/Courtesy Kim Cobain) ( Kurt Cobain House )

In this undated photo provided by Kim Cobain, a young Kurt Cobain plays guitar in his childhood home in Aberdeen, Wash. (AP Photo/Courtesy Kim Cobain) ( Kurt Cobain House )

This undated photo provided by Kim Cobain, Kurt Cobain's sister, shows a young Kurt Cobain, left, and Kim in their childhood home in Aberdeen, Wash. Cobain's mother, Wendy O'Connor, is putting the 1.5-story bungalow _ which is assessed at less than $67,000 _ on the market for $500,000. But she'd also be happy entering into a partnership with anyone who wants to turn it into a museum. (AP Photo/Courtesy Kim Cobain) ( Kurt Cobain House )

This undated photo provided by Kim Cobain, Kurt Cobain's sister, shows a young Kurt Cobain, left, and Kim in their childhood home in Aberdeen, Wash. Cobain's mother, Wendy O'Connor, is putting the 1.5-story bungalow _ which is assessed at less than $67,000 _ on the market for $500,000. But she'd also be happy entering into a partnership with anyone who wants to turn it into a museum. (AP Photo/Courtesy Kim Cobain) ( Kurt Cobain House )

Kurt Cobain performing at the 1992 MTV Video Music Awards on September 9, 1992 Photo by Frank Micelotta/ImageDirect ( ID_Kurt_Cobain_02 )