#50 - Alanis Morisette - 'Jagged Little Pill'

VANCOUVER, BC - FEBRUARY 28: Alanis Morissette performs during the Closing Ceremony of the Vancouver 2010 Winter Olympics at BC Place on February 28, 2010 in Vancouver, Canada. (Photo by Cameron Spencer/Getty Images)

#49 - The Breeders 'Last Splash'

INDIO, CA - APRIL 25: Musicians Kim Deal (L) and Kelley Deal from the band The Breeders perform during day 1 of the Coachella Valley Music And Arts Festival held at the Empire Polo Field on April 25, 2008 in Indio, California. (Photo by Karl Walter/Getty Images)

#48 - Bonnie Raitt 'Give It Up'

LOS ANGELES, CA - FEBRUARY 12: Musician Bonnie Raitt performs onstage at the 54th Annual GRAMMY Awards held at Staples Center on February 12, 2012 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

#47 - Lucinda Williams 'Car Wheels On A Gravel Road'

DUBLIN, IRELAND - MAY 8: Singer Lucinda Williams performs at the Olympia Theatre May 8, 2003 in Dublin, Ireland. (Photo by Getty Images)

#46 - Salt-n-Pepa 'Hot, Cool and Vicious'

MELBOURNE, AUSTRALIA - FEBRUARY 21: Cheryl 'Salt' Wray and Sandra 'Pepa' Denton of Salt-n-Pepa perform on stage at the Melbourne leg of the Good Vibrations music festival at Flemington Racecourse on February 21, 2010 in Melbourne, Australia. (Photo by Scott Barbour/Getty Images)

#45 - Taylor Swift 'Speak Now'

AUCKLAND, NEW ZEALAND - MARCH 18: Taylor Swift performs live on stage at Vector Arena on March 18, 2012 in Auckland, New Zealand. (Photo by Sandra Mu/Getty Images)

#44 - Siouxsie and the Banshees 'Once Upon A Time'

LONDON - JULY 04: Siouxsie performs on the Sandisk stage during day 2 of the O2 Wireless Festival 2008 on July 4, 2008 in London, England. (Photo by Gareth Cattermole/Getty Images)

#43 - Lauryn Hill 'The Miseducation of Lauryn Hill'

INDIO, CA - APRIL 15: Lauryn Hill performs during Day 1 of the Coachella Valley Music & Arts Festival 2011 held at the Empire Polo Club on April 15, 2011 in Indio, California. (Photo by Kevin Winter/Getty Images)

#42 - Linda Ronstadt 'Heart Like A Wheel'

BEVERLY HILLS - DECEMBER 10: Recording artist Linda Ronstadt performs at the Rosemary Clooney's Life And Career Celebrated by her family at the Beverly Hilton Hotel on December 10, 2002 in Beverly Hills, California. The gala benefits the Mayo Clinic Rosemary Clooney Pulmonary Research Fund. (Photo by Frederick M. Brown/Getty Images)

#41 - Cyndi Lauper 'She's So Unusual'

NEW YORK - NOVEMBER 18: Singer Cyndi Lauper performs at Tower Records to promote her new album "At Last" November 18, 2003 in New York City. (Photo by Peter Kramer/Getty Images)

#40 - Yoko Ono 'Walking On Thin Ice'

PRAGUE, CZECH REPUBLIC - DECEMBER 11: Yoko Ono, widow of Beatles star John Lennon, visits the John Lennon Peace Wall December 9, 2003 in Prague, Czech Republic. Ono is in Prague to promote her exhibition of photographs, "Women's Room." Prague youth started the tribute to Lennon on a wall in the center of the city shortly after Lennon's death in 1980, and graffiti artists have been decorating it ever since. (Photo Sean Gallup/Getty Images)

#39 - Fiona Apple 'Extraordinary Machine'

NEW YORK - AUGUST 14: Musician Fiona Apple performs live with Nickel Creek at Rumsey Playfield in Central Park August 14, 2007 in New York City. (Photo by Scott Wintrow/Getty Images)

#38 - Bjork 'Post'

NEW YORK - MAY 08: Singer Bjork and The Dirty Projectors perform onstage at Housing Works Bookstore Cafe's "Live from Home" benefit concert series at Housing Works Bookstore Cafe on May 8, 2009 in New York City. (Photo by Roger Kisby/Getty Images)

#37 - Beyonce '4'

LOS ANGELES, CA - AUGUST 28: Singer Beyonce Knowles performs onstage during the 2011 MTV Video Music Awards at Nokia Theatre L.A. LIVE on August 28, 2011 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

#36 - X-Ray Spex 'Germ Free Adolescents' (Photo Not Available)

Rolling Stone Magazine

(Photo credit PABALLO THEKISO/AFP/Getty Images)

#35 - The Ronettes 'The Best of the Ronettes'

NEW YORK - MAY 17: (U.S. TABLOIDS AND HOLLYWOOD REPORTER OUT) The Ronettes from "Little Shop Of Horrors" attend the Manhattan Theatre Club's Spring Gala May 17, 2004 in New York City. (Photo by Peter Kramer/Getty Images)

#34 - Go-Go's 'Beauty and the Beat'

381849 01: Quintessential Female Pop Group Go-Go's Have Confirmed They Are In The Studio Working On Their First New Studio Cd Release In 15 Years, Due Out On Beyond Music In The Spring. (Photo By Getty Images)

#33 - Irma Thomas 'Soul Queen of New Orleans'

NEW ORLEANS, LA - APRIL 30: Singer/Songwriter Irma Thomas performs during the 2011 New Orleans Jazz & Heritage Festival - Day 2 presented by Shell at The Fair Grounds Race Course on April 30, 2011 in New Orleans, Louisiana. (Photo by Rick Diamond/Getty Images)

#32 - Dolly Parton 'Best of Dolly Parton'

NASHVILLE, TN - JUNE 08: Singer Dolly Parton performs during Marty Stuart's 10th Annual Late Night Jam at the Ryman Auditorium on June 8, 2011 in Nashville, Tennessee. (Photo by Mike Coppola/Getty Images)

#31 - PJ Harvey 'Stories From the City, Stories From The Sea'

INDIO, CA - APRIL 17: Singer PJ Harvey performs during Day 3 of the Coachella Valley Music & Arts Festival 2011 held at the Empire Polo Club on April 17, 2011 in Indio, California. (Photo by Frazer Harrison/Getty Images)

#30 - Alicia Keys 'As I Am'

LOS ANGELES, CA - JUNE 12: Recording artist Alicia Keys performs at City Of Hope Honors Clear Channel CEO Bob Pittman With Spirit Of Life Award at The Geffen Contemporary at MOCA on June 12, 2012 in Los Angeles, California. (Photo by Michael Kovac/Getty Images for City of Hope)

#29 - M.I.A. 'Kala'

INDIANAPOLIS, IN - FEBRUARY 05: M.I.A. performs during the Bridgestone Super Bowl XLVI Halftime Show at Lucas Oil Stadium on February 5, 2012 in Indianapolis, Indiana. (Photo by Christopher Polk/Getty Images)

#28 - Yeah Yeah Yeahs 'It's Blitz!'

NEW YORK - MAY 25: Karen O of the Yeah Yeah Yeahs performs at the 2010 MoMA Party in the Garden benefit at The Museum of Modern Art on May 25, 2010 in New York City. (Photo by Andrew H. Walker/Getty Images)

#27 - Dionne Warwick 'Presenting. . .'

BEVERLY HILLS, CA - FEBRUARY 12: Singer Dionne Warwick performs at the 2011 Pre-GRAMMY Gala and Salute To Industry Icons Honoring David Geffen at Beverly Hilton on February 12, 2011 in Beverly Hills, California. (Photo by Kevork Djansezian/Getty Images)

#26 - Janet Jackson 'Rhythm Nation'

SYDNEY, AUSTRALIA - NOVEMBER 05: Janet Jackson performs live on stage at the Sydney Opera House on November 5, 2011 in Sydney, Australia. (Photo by Ryan Pierse/Getty Images)

#25 - Heart 'Little Queen'

LOS ANGELES, CA - MAY 24: Musicians Nancy Wilson (L) and Ann Wilson of the rock band Heart pose at MusiCares' "An Evening with Heart" at The Grammy Museum on May 24, 2010 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

#24 - Hole 'Live Through This'

MILAN, ITALY - FEBRUARY 19: Courtney Love and Hole perform at Magazzini Generali on February 19, 2010 in Milan, Italy. (Photo by Vittorio Zunino Celotto/Getty Images)

#23 - Donna Summer 'Bad Girls'

PASADENA, CA - JANUARY 09: Singer Donna Summer performs onstage during the 'Great Performances: Hitman Returns - David Foster & Friends' panel at the PBS portion of the 2011 Winter TCA press tour held at the Langham Hotel on January 9, 2011 in Pasadena, California. (Photo by Frederick M. Brown/Getty Images)

#22 - Liz Phair 'Exile in Guyville'

WASHINGTON - AUGUST 28: Singer/songwriter Liz Phair performs her album ''Exile in Guyville'' at the 9:30 Club on August 28, 2008 in Washington, DC. (Photo by Brendan Hoffman/Getty Images)

#21 - Carole King 'Tapestry'

NEW YORK - JULY 15: Singer/songwriter Carole King performs onstage during the Toyota Concert Series on the Today Show July 15, 2005 in New York City. (Photo by Scott Gries/Getty Images)

#20 - Etta James 'At Last!'

NEW ORLEANS - APRIL 26: Recording Artist Etta James performs at the 2009 New Orleans Jazz & Heritage Festival at the Fair Grounds Race Course on April 26, 2009 in New Orleans, Louisiana. (Photo by Rick Diamond/Getty Images)

#19 - Joan Jett 'Bad Reputation'

COLUMBIA, MD - SEPTEMBER 25: Joan Jett and the Blackhearts perform at the 2010 Virgin Mobile FreeFest at Merriweather Post Pavillion on September 25, 2010 in Columbia, Maryland. (Photo by Taylor Hill/Getty Images)

#18 - Madonna 'Like A Prayer'

US singer Madonna performs during her "MDNA concert" on June 20, 2012 at the Palau Sant Jordi in Barcelona. AFP PHOTO/ LLUIS GENE (Photo credit should read LLUIS GENE/AFP/GettyImages)

#17 - Sleater-Kinney 'The Hot Rock'

LOS FELIZ, CA - SEPTEMBER 4: Carrie Brownstein, Janet Weiss and Corin Tucker of Sleater-Kinney perform at Barnsdall Art Park as part of ArthurFest on September 4, 2005 in Los Feliz, California. (Photo by Karl Walter/Getty Images)

#16 - Labelle 'Nightbirds'

Patti LaBelle performs the National Anthem at the "NBA All-Star Game" at the First Union Center in Philadelphia, Pa. 2/10/02 Photo by Scott Gries/NBAE/Getty Images

*#15 - Patsy Cline 'The Patsy Cline Collection'

The silhouette and it's reflection are of US Country singer Garth Brooks (L) while he looks at a outfit worn by US country music legend Patsy Cline on display at the Smithsonian Institution's temorary space for American Heritage artifacts 04 December, 2007 at the National Air and Space Museum in Washington, DC. AFP PHOTO / TIM SLOAN (Photo credit should read TIM SLOAN/AFP/Getty Images)

#14 - The Pretenders 'The Pretenders' (Chrissie Hynde)

LOS ANGELES, CA - SEPTEMBER 03: Chrissie Hunde of The Pretenders performs at the Greek Theatre on September 3, 2009 in Los Angeles, California. (Photo by Michael Buckner/Getty Images)

#13 - Mary J. Blige 'My Life'

BEVERLY HILLS, CA - JUNE 16: Recording artist Mary J. Blige performs at the 100th anniversary celebration of the Beverly Hills Hotel & Bungalows supporting the Motion Picture & Television Fund and the American Comedy Fund hosted by Brett Ratner and Warren Beatty at Beverly Hills Hotel on June 16, 2012 in Beverly Hills, California. (Photo by Michael Buckner/Getty Images for BHH)

#12 - Janis Joplin 'Pearl'

NEW YORK - DECEMBER 10: A 1969 mugshot of entertainer Janis Joplin stands on display at Christie's December 10, 2004 in New York City. Christie's, in a partnership with Julien's, will hold a Rock & Roll and Entertainment Memorabilia auction Friday, December 17, 2004. The sale, which will include such items as guitars owned by Beatle George Harrison, an Academy Award from 1941 for Best Picture, interview tapes of John Lennon, letters from Kurt Cobain to Courtney Love and numerous Elvis memorabilia, is expected to realize in the region of $3 million. (Photo by Spencer Platt/Getty Images)

#11 - Lady Gaga 'Born This Way'

NEW YORK - MAY 19: Singer Lady Gaga performs onstage at the 2008 NewNowNext Awards at the MTV studios on May 19, 2008 in New York City. (Photo by Bryan Bedder/Getty Images)

#10 - Bikini Kill 'The Singles' (Kathleen Hanna)

NEW YORK - SEPTEMBER 12: Kathleen Hanna attends the Alice Roi Spring 2006 fashion show during Olympus Fashion Week at Bryant Park September 12, 2005 in New York City. (Photo by Fernando Leon/Getty Images)

#9 - The Surpremes 'Anthology'

E367079 05: Diana Ross, center, and two former members of the Supremes, Lynda Laurence and Scherrie Payne hold a news conference April 4, 2000, at Grand Central Terminal in New York City to announce the upcoming U.S. tour of Diana Ross and the Surpremes. (Photo by Chris Hondros)

#8 - Blondie 'Parallel Lines'

Blondie at Tibetan Freedom Concert held in Wisconsin on June 13, 1999 (Photo Frank Micelotta/Getty Images)

#7 - Missy Elliot 'Under Construction'

Missy Elliott performed with Nelly Furtado live on 'The Tonight Show With Jay Leno' at the NBC Studios in Burbank, Ca. 6/14/01. (Los Angeles) Photo by Kevin Winter/Getty Images

#6 - Adele '21'

British singer-songwriter Adele accepts the British Female Solo Artist award at the BRIT Awards 2012 in London on February 21, 2012. AFP PHOTO / LEON NEAL (Photo credit should read LEON NEAL/AFP/Getty Images)

#5 - Patti Smith 'Horses'

Sanremo, ITALY - FEBRUARY 16: Patti Smith performs on stage at the third day of the 62th Sanremo Song Festival at the Ariston Theatre on February 16, 2012 in Sanremo, Italy. (Photo by Daniele Venturelli/Getty Images)

#4 - Fleetwood Mac 'Rumours'

NEW YORK - MARCH 19: (L-R) John McVie, Stevie Nicks, Mick Fleetwood and Lindsey Buckingham of Fleetwood Mac perform at Madison Square Garden March 19, 2009 in New York City. (Photo by Rob Loud/Getty Images)

#3 - Dusty Springfield 'Dusty In Memphis'

06/11/99. Dusty Springfield's ''The Look of Love'' Album cover. Picture by DAN CALLISTER Online USA Inc

#2 - Joni Mitchell 'Blue'

LOS ANGELES, CA - OCTOBER 28: Recording artist Joni Mitchell performs during the Thelonious Monk Jazz Tribute Concert For Herbie Hancock at the Kodak Theatre on October 28, 2007 in Los Angeles, California. (Photo by Frederick M. Brown/Getty Images)

#1 - Aretha Franklin 'I Never Loved A Man the Way I Love You'

385218 47: R & B artist Aretha Franklin sings at the Lane Bryant fashion show February 5, 2001 at Studio 54 in New York City. (Photo by George De Sota/Newsmakers)