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Photos   -  CMT All-Time Top 40: Artists Choice No. 40

Rock Stars Aerosmith perform at 02 Arena on June 15, 2010 in London, England.
Alan Jackson Alan Jackson perfoms at the Greek Theatre on July 25, 2012, in Los Angeles.
Carrie Underwood Carrie Underwood performs onstage during the 47th annual CMA Awards on Nov. 6, 2013, in Nashville.
Carrie Underwood Carrie Underwood performs on Feb. 19, 2014, in Nashville.
Aerosmith Aerosmith perform in Los Angeles on May 3, 2006.
Alan Jackson Alan Jackson performs onstage during the 51st annual ASCAP Country Music awards on Nov. 4, 2013, in Nashville.
Aerosmith Aerosmith perform at Fenway Park on Aug. 14, 2010, in Boston.
Alan Jackson Alan Jackson performs at the funeral service for George Jones at the Grand Ole Opry on May 2, 2013, in Nashville.
Lighting Up the Stage Carrie Underwood's gown shines during the 2013 Grammy Awards.
Aerosmith Aerosmith perform on May 3, 2006, in Los Angeles.
Angel in White Carrie Underwood looks great onstage on May 3, 2012.
Alan Jackson Alan Jackson performs during Playin' Possum! The Final No Show Tribute To George Jones on Nov. 22, 2013, in Nashville.
Aerosmith Aerosmith perform on the <I>Today</I> show on Nov. 2, 2012.
Alan Jackson Alan Jackson performs during the San Antonio Stock Show And Rodeo on Feb. 10, 2014, in San Antonio.
Blown Away Tour Carrie Underwood taps into her rocker chic side during her 2012 "Blown Away" tour.