The Evolution of Gladys Knight

Hall of Famers  - Over the span of their recording career, the revered singing group earned seven Grammy awards, the Soul Train Heritage Award ('88) and were inducted into the Rock and Roll Hall of Fame ('96) and The Vocal Group Hall of Fame ('01).

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Gladys Knight -  Gladys Knight and the Pips perform on "The Ed Sullivan Show." (Photo: CBS /Landov)

Gladys Knight - Photo of American singer Gladys KNIGHT performing live on stage circa 1970. (Photo: David Redfern/Redferns)

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Gladys Knight - Photo of American singer Gladys KNIGHT performing live on stage circa 1970. (Photo: David Redfern/Redferns)

Photo By Photo: David Redfern/Redferns

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Gladys Knight - Gladys Knight & The Pips, Apollo Theatre Harlem. 1973 (Photo: Redferns/GettyImages)

Gladys Knight - Gladys Knight backstage at Centric's 3rd Annual Soul Train Awards at the Fox Theatre, November 17, 2011 in Atlanta, Georgia. (Photo: Frank Micelotta/PictureGroup)

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Gladys Knight - Gladys Knight backstage at Centric's 3rd Annual Soul Train Awards at the Fox Theatre, November 17, 2011 in Atlanta, Georgia. (Photo: Frank Micelotta/PictureGroup)

Gladys Knight - Singer Gladys Knight presents the Lifetime Achievement Award to Patti LaBelle onstage during the BET Awards '11 held at the Shrine Auditorium on June 26, 2011 in Los Angeles, California. (Photo: Kevin Winter/Getty Images)

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Gladys Knight - Singer Gladys Knight presents the Lifetime Achievement Award to Patti LaBelle onstage during the BET Awards '11 held at the Shrine Auditorium on June 26, 2011 in Los Angeles, California. (Photo: Kevin Winter/Getty Images)

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Gladys Knight: May 28 - The Empress of Soul celebrates her landmark 70th birthday. (Photo: Kevin Winter/Getty Images)

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Gladys Knight - Singer Gladys Knight performs onstage at the BET Awards 05 at the Kodak Theatre on June 28, 2005 in Hollywood, California. (Photo: Kevin Winter/Getty Images)

Gladys Knight - Legendary soul singer Gladys Knight was on hand to present the Top Male Artist Award to Lil Wayne.(Photo: Ethan Miller/Billboards2012/Getty Images for ABC)

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Gladys Knight - Singer Gladys Knight presents the Male Artist of the Year award onstage at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo: Ethan Miller/Billboards2012/Getty Images for ABC)