Ann Wilson 1980

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Portrait of American musician Ann Wilson of the rock group Heart, 1980s.(Photo by Hulton Archive/Getty Images)

Ann Wilson 2014

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LOS ANGELES, CA - MARCH 04: Musicians Ann Wilson of the band Heart arrive at the Country Music Hall Of Fame & Museum's "All For The Hall" fundraising concert at Club Nokia on March 4, 2014 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images)

Aretha Franklin 1968

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American soul singer Aretha Franklin, a star on the Atlantic record label. (Photo by Express Newspapers/Getty Images)

Aretha Franklin 2013

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WASHINGTON, DC - DECEMBER 06: Soul singer Aretha Franklin performs during the National Christmas Tree lighting ceremony at the Ellipse December 6, 2013 in Washington, DC. U.S. President Barack Obama and his family were joined by entertainers at the annual event to celebrate the holiday season. (Photo by Alex Wong/Getty Images)

Barry Gibb 1969

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1st June 1969: Barry Gibb of the Bee Gees pop group arrives at Uxbridge Court in the back of a chauffeur driven car; he is to appear in court on a smuggling charge. (Photo by P. Felix/Express/Getty Images)

Barry Gibb 2014

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NASHVILLE, TN - OCTOBER 27: Recording Artist Barry Gibb performs at Country Music Hall of Fame and Museum on October 27, 2013 in Nashville, Tennessee. (Photo by Jason Davis/Getty Images)

Billy Joel 1978

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Portrait of American singer and songwriter Billy Joel, circa 1978. (Photo by Express Newspapers/Getty Images)

Billy Joel 2014

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LAS VEGAS, NV - JUNE 07: Singer/songwriter Billy Joel performs at the MGM Grand Garden Arena on June 7, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

Bob Seger 1977

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18th October 1977: American rock singer and songwriter Bob Seger, and his Silver Bullet Band, Drew Abbott, Robyn Robbins, Alto Reed, Chris Campbell and Charlie Allen Martin, in London, for their first British tour. (Photo by Malcolm Clarke/Keystone/Getty Images)

Bob Seger 2012

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NEW YORK, NY - JUNE 14: Inductee Bob Seger attends the Songwriters Hall of Fame 43rd Annual induction and awards at The New York Marriott Marquis on June 14, 2012 in New York City. (Photo by Gary Gershoff/Getty Images for Songwriters Hall Of Fame)

David Bowie 1973

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David Bowie in concert at the Hammersmith Odeon, London, during the last performance he made in the guise of his character Ziggy Stardust. (Photo by Graham Wood/Getty Images)

David Bowie 2010

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NEW YORK - JUNE 07: David Bowie attends the 2010 CFDA Fashion Awards at Alice Tully Hall at Lincoln Center on June 7, 2010 in New York City. (Photo by Andrew H. Walker/Getty Images)

Elton John 1977

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British pop singer and pianist Elton John pulls a face while playing the piano during a concert at the Rainbow Theatre, London. (Photo by Robin Jones/Getty Images)

Elton John 2014

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MANCHESTER, TN - JUNE 15: Artist Sir Elton John performs during the 2014 Bonnaroo Music & Arts Festival on June 15, 2014 in Manchester, Tennessee. (Photo by Jason Merritt/Getty Images)

Eric Clapton 1973

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13th January 1973: British blues-rock singer and guitarist, Eric Clapton, in concert at the Rainbow Rooms. (Photo by Express/Express/Getty Images)

Eric Clapton 2014

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NEW YORK, NY - APRIL 13: Eric Clapton performs on stage during the 2013 Crossroads Guitar Festival at Madison Square Garden on April 13, 2013 in New York City. (Photo by Larry Busacca/Getty Images)

Keith Richards 1963

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Keith Richards enjoys a cigarette. Once a Post Office worker, he is now guitarist with the Rolling Stones, the first London group to draw the sharks away from the longheld Merseyside monopoly. (Photo by Chris Ware/Getty Images)

Keith Richards 2014

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Keith Richards, guitarist from British rock group The Rolling Stones performs on stage at Hayarkon Park in the Mediterranean coastal city of Tel Aviv, on June 4, 2014. The Rolling Stones staged a live concert in Tel Aviv as a part of their '14-On-Fire' world tour. AFP PHOTO / JACK GUEZ (Photo credit should read JACK GUEZ/AFP/Getty Images)

Mick Jagger 1963

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An early portrait of Rolling Stones singer Mick Jagger, circa 1963. (Photo by Keystone Features/Hulton Archive/Getty Images)

Mick Jagger 2014

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Mick Jagger of the British rock band the Rolling Stones performs during a concert at the Stade de France in Saint-Denis, outside Paris, on June 13, 2014. AFP PHOTO / ERIC FEFERBERG (Photo credit should read ERIC FEFERBERG/AFP/Getty Images)

Nancy Wilson 1980

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Portrait of American musician Nancy Wilson of the rock group Heart, circa 1980s. (Photo by Hulton Archive/Getty Images)

Nancy Wilson 2014

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LOS ANGELES, CA - MARCH 04: Musicians Nancy Wilson of the band Heart arrive at the Country Music Hall Of Fame & Museum's "All For The Hall" fundraising concert at Club Nokia on March 4, 2014 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images)

Paul McCartney 1962

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1962: Singer-songwriter Paul McCartney of The Beatles. (Photo by Keystone/Getty Images)

Paul McCartney 2014

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Paul McCartney greets fans and journalists upon his arrival at the Haneda airport in Tokyo on May 15, 2014. McCartney is to play Tokyo's Nippon Budokan Hall on May 21, marking his first return to the venue since appearing there with The Beatles in 1966. AFP PHOTO/Toshifumi KITAMURA (Photo credit should read TOSHIFUMI KITAMURA/AFP/Getty Images)

Paul Simon 1973

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Singer, songwriter and guitarist Paul Simon, famous for his earlier partnership with Art Garfunkel as Simon & Garfunkel. Original Publication: People Disc - HO0096 (Photo by Wood/Getty Images)

Paul Simon 2014

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NEW YORK, NY - APRIL 17: Paul Simon performs during the 25th Anniversary Rainforest Fund Benefit Concert at Carnegie Hall on April 17, 2014 in New York City. (Photo by Jamie McCarthy/Getty Images)

Peter Frampton 1968

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Peter Frampton, singer and guitarist with The Herd, circa 1968. (Photo by Keystone Colour/Getty Images)

Peter Frampton 2014

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LOS ANGELES, CA - JANUARY 27: Musician Peter Frampton performs onstage during "The Night That Changed America: A GRAMMY Salute To The Beatles" at the Los Angeles Convention Center on January 27, 2014 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

Ringo Starr 1963

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Beatles drummer Ringo Starr, 1963. (Photo by Keystone/Hulton Archive/Getty Images)

Ringo Starr 2014

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LOS ANGELES, CA - JANUARY 27: Recording artist Ringo Starr performs onstage during "The Night That Changed America: A GRAMMY Salute To The Beatles" at the Los Angeles Convention Center on January 27, 2014 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

Robert Plant 1970

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16th September 1970: Lead singer of rock band Led Zeppelin, Robert Plant, after receiving his Melody Maker Award for Best British Male Singer. (Photo by Roger Jackson/Central Press/Getty Images)

Robert Plant 2013

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UK singer Robert Plant performs during the 13th music festival Mawazine in Rabat on June 5, 2014. AFP PHOTO / FADEL SENNA (Photo credit should read FADEL SENNA/AFP/Getty Images)

Rod Stewart 1973

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British rock star Rod Stewart onstage with the Faces in Los Angeles, 1973. (Photo by Keystone Features/Hulton Archive/Getty Images)

Rod Stewart 2014

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British singer Rod Stewart performs during the Viña del Mar International Song Festival on February 27, 2014 in Vina del Mar,Chile.AFP PHOTO/FRANCESCO DEGASPERI (Photo credit should read FRANCESCO DEGASPERI/AFP/Getty Images)

Stevie Nicks 1963

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Promotional portrait of American pop and rock singer Stevie Nicks (of the group Fleetwood Mac) as she sits and looks upward, dressed in a lace shawl, late 1970s. (Photo by Hulton Archive/Getty Images)

Stevie Nicks 2014

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BEVERLY HILLS, CA - MAY 13: Singer-songwriter Stevie Nicks, recipient of the BMI Icon Award speaks onstage at the 62nd annual BMI Pop Awards at the Regent Beverly Wilshire Hotel on May 13, 2014 in Beverly Hills, California. (Photo by Kevin Winter/Getty Images)

Stevie Wonder 1963

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Popular American musician and singer Stevie Wonder smiles and sings into a microphone in a recording studio in this early promotional photo, 1963. (Photo by Hulton Archive/Getty Images)

Stevie Wonder 2014

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PASADENA, CA - FEBRUARY 22: Singer Stevie Wonder attends the 45th NAACP Image Awards presented by TV One at Pasadena Civic Auditorium on February 22, 2014 in Pasadena, California. (Photo by Imeh Akpanudosen/Getty Images for TV One)

Sting 1979

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1979: Pop singer and bassplayer Sting, born Gordon Sumner, of the group The Police. (Photo by Evening Standard/Getty Images)

Sting 2014

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NEW YORK, NY - MAY 06: Sting attends the "Penny Dreadful" series world premiere at The Highline Hotel on May 6, 2014 in New York City. (Photo by Andrew H. Walker/Getty Images)