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Robert Plant performs as part of the BBC Electric proms 2010 held at The Roundhouse on October 29, 2010 in London, England. (Photo by Getty Images/Getty Images) ( 62246787 )

Former Led Zeppelin lead singer Robert Plant performs with his band The Sensational Space Shifters during the Timbre Rock & Roots Festival 2013 on March 21, 2013 in Singapore. (Photo by Chris McGrath/Getty Images) ( 73882831 )

Former Led Zeppelin lead singer Robert Plant performs on stage with his band The Sensational Space Shifters at Bluesfest Byron Bay 2013 - Day 3 on March 30, 2013 in Byron Bay, Australia. (Photo by Matt Roberts/Getty Images) ( 73994261 )

Former Led Zeppelin lead singer Robert Plant performs on stage with his band The Sensational Space Shifters at Bluesfest Byron Bay 2013 - Day 3 on March 30, 2013 in Byron Bay, Australia. (Photo by Matt Roberts/Getty Images) ( 73993617 )

Singers/Songwriters Robert Plant and Gregg Allman backstage at the 10th Americana Music Association honors and awards at the Ryman Auditorium on October 13, 2011 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images) ( 66843405 )

Robert Plant and Patty Griffin & The Band of Joy performs during the 10th Americana Music Association honors and awards>> at the Ryman Auditorium on October 13, 2011 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images) ( 66845187 )

Singers Robert Plant (L) and Roger Daltrey appear at a press conference to announce the Daltrey/Townsend Teen & Young Adult Cancer Program at UCLA on November 4, 2011 in Los Angeles, California. (Photo by Kevin Winter/Getty Images) ( 67160464 )

Led Zeppelin lead singer Robert Plant signs the hood of a 2003 Cadillac CTS at the General Motors world headquarters August 22, 2002 in Detroit, Michigan . Plant, who was in Detroit for a concert, attended a GM celebration of company's 100th anniversary of the Cadillac line. (Photo by Bill Pugliano/Getty Images) ( 409580_04_robertplant )

British rock band Led Zeppelin's (L-R) John Paul Jones, Robert Plant and Jimmy Page pose at a press conference to announce the release of a video recording of their one-off 2007 concert in London on September 21, 2012. The legendary British rock band Led Zeppelin disbanded in 1980 after the unexpected death of drummer John Bonham. For the next 27 years the surviving three members pursued solo projects coming together for a reunion at a one off concert in London in 2007. An official video recording of that concert will be released next month in multiple formats. ADRIAN DENNIS/AFP/GettyImages ( DV1314959 )

John Paul Jones, Jimmy Page and Robert Plant pose for photographers during the 35th Kennedy Center Honors at the Kennedy Center Hall of States on December 2, 2012 in Washington, DC. (Photo by Kris Connor/Getty Images) ( 72488265 )

Former Led Zeppelin lead singer Robert Plant performs with his band The Sensational Space Shifters during the Timbre Rock & Roots Festival 2013 on March 21, 2013 in Singapore. (Photo by Chris McGrath/Getty Images) ( 73882828 )

Robert Plant performs at the Greek Theatre in Los Angeles, Ca. Thursday, Sept. 12, 2002. Photo by Kevin Winter/ImageDirect. ( id_plant_01.JPG )

Saint-Cloud, FRANCE: British singer Robert Plant performs during the 3rd edition of the Rock-en-Seine Music Festival, in Saint-Cloud near Paris 26 August 2005. BERTRAND GUAY/AFP/Getty Images ( Par329914 )

English rock singer Robert Plant, famous for being the frontman for the band Led Zeppelin, performs during the opening night of the 40th Montreux Jazz festival, on late 30 June 2006 in Montreux. The night was a tribute to Ahmet Ertegun, the founder of the music label Atlantic Records. FABRICE COFFRINI/AFP/Getty Images ( Hkg234049 )

British rock legend Robert Plant performs with his band the Strange Sensation during the Somerset House Summer Series at Somerset House on July 10, 2006 in London, England. (Photo by Jim Dyson/Getty Images) ( 71386154JD002_Robert_Plant )

British rock legend Robert Plant performs with his band the Strange Sensation during the Somerset House Summer Series at Somerset House on July 10, 2006 in London, England. (Photo by Jim Dyson/Getty Images) ( 71386154JD012_Robert_Plant )

Robert Plant performs during day one of the New Orleans Jazz & Heritage Festival at the Fair Grounds Race Course April 25, 2008 in New Orleans, Louisiana. (Photo by Sean Gardner/Getty Images) ( 51819594 )

MANCHESTER, TN - JUNE 15: Alison Krauss and Robert Plant perform during day four of the 2008 Bonnaroo Music and Arts Festival on June 15, 2008 in Manchester, Tennessee. (Photo by Jeff Gentner/Getty Images) ( 81528411JG070_2008_Bonnaroo )

Robert Plant and Alison Krauss perform before accepting the Album of the Year award for their album "Raising the Sand" during the 51st annual Grammy awards held at the Staples Center in Los Angeles on February 8, 2009. ROBYN BECK/AFP/Getty Images ( Was2162695 )

Musician Robert Plant, winner of five awards; Best Country Collaboration With Vocals, Best Pop Collaboration With Vocals, Best Best Contemporary Folk/Americana Album, Best Record, and Album of the Year, poses in the press room during the 51st Annual Grammy Awards held at the Staples Center on February 8, 2009 in Los Angeles, California. (Photo by Jason Merritt/Getty Images) ( 56679518 )

Former Led Zeppelin singer Robert Plant and bluegrass queen Alison Krauss hold their Grammy awards in the photo room during the 51st annual Grammy awards held at the Staples Center in Los Angeles, on February 8, 2009. Plant and Krauss scooped five awards, including the coveted album of the year honor and record of the year prize for work stemming from their acclaimed "Raising Sand." VALERIE MACON/AFP/Getty Images ( Was2162714 )

Robert Plant sings as he performs during a Robert Plant and Jimmy Page concert, at the Rosemont Horizon, near Chicago, Illinois, April 28, 1995. (Photo by Tim Boyle/Getty Images) ( T432904_04 )

Robert Plant performs for a sold out crowd at the Live Aid concert at JFK Stadium in Philadelphia, Pennsylvania, July 13, 1985. Photo by Frank Micelotta/ImageDirect. ( ID_Live_Aid_014.jpg )

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British rock singer Robert Plant (L) of the band Led Zeppelin and the group's road manager, Richard Cole, relax on a bed covered by a fur rug and discuss details of their upcoming concert, New York City, New York, July 30, 1973. (Photo by Express Newspapers/Getty Images) ( T414714_07 )

12th May 1977: Robert Plant, singer, (left) and John Paul Jones, bass and keyboard player, (right) of the British rock group Led Zeppelin. (Photo by Evening Standard/Getty Images) ( 95d38/huch/1789/21 )

June 1973: British rock band Led Zeppelin. From left to right, Robert Plant, Jimmy Page, John Bonham (1947 - 1980), John Paul Jones. (Photo by Evening Standard/Getty Images) ( martin/3321 )

16th September 1970: Three of the four members of British heavy rock group Led Zeppelin in Embankment Gardens, London. They pushed the Beatles down to number two, taking the Best British Group award at the Melody Maker Pop Polls today at the Savoy Hotel. They are, from left to right; singer Robert Plant, guitarist Jimmy Page and drummer John Bonham. (Photo by Ian Showell/Keystone/Getty Images) ( 95f45/huch/2362/16 )

28th November 1979: Three members of rock group Led Zeppelin with their seven Melody Maker awards. They are, from left to right John Paul Jones (bass, keyboards), Robert Plant (vocals) and John Bonham (1947 - 1980) (drums). (Photo by Keystone/Getty Images) ( martyn3/syssym/ssh123 )

16th September 1970: British rock band Led Zeppelin collect their geode awards after being voted top British group in the Melody Maker Pop Poll in London. From left to right, they are Jimmy Page, Robert Plant (who also won the Best British Singer award), and John Bonham. (Photo by Roger Jackson/Central Press/Getty Images) ( 00n/46/huty/14936/06 )

1st October 1970: Folk singer Sandy Denny with Robert Plant, singer of the rock group Led Zeppelin, voted Britain's top singer in the Melody Maker poll. (Photo by Michael Stroud/Express/Getty Images) ( martin/1858 )

British musician Robert Plant visits members of the rock group Heart after their performance in Milton Keynes, England, circa 1980s. (L-R) Ann Wilson, Robert Plant, Nancy Wilson, Marke Andes, Denny Carmassi and Howard Leese talk on the concert grounds. (Photo by Epic/Hulton Archive/Getty Images) ( T698691_06 )

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) ( 00f/19/huty/14620/09 )