The Grateful Dead: Rock's greatest grand finale

Fireworks explode as veteran rock band The Grateful Dead perform during the second day of their last three concerts at Soldier Field stadium in Chicago, Illinois July 4, 2015, in this handout courtesy of Jay Blakesberg. Picture taken July 4, 2015. (REUTERS)

Spectators fill the Soldier Field stadium as rock band The Grateful Dead performs during the first of their last three concerts, in Chicago, Illinois July 3, 2015, in this handout courtesy of Jay Blakesberg.  (REUTERS)

Rock band The Grateful Dead performs during the first of their last three concerts at Soldier Field stadium in Chicago, Illinois July 3, 2015, in this handout courtesy of Jay Blakesberg.  (REUTERS)

A Grateful Dead fan waits near a sign for an exhibition at the Field Museum in Chicago ahead of a concert at nearby Soldier Field on July 3, 2015. Thousands of “Deadhead” fans have flocked to Chicago for concerts by the classic countercultural band, whose members say that the three Independence Day weekend shows will be their last.  (AFP)

A general view of atmosphere during Fare Thee Well, A Tribute To The Grateful Dead at Soldier Field on July 3, 2015 in Chicago, Illinois.   (Getty Images/AFP)

Matt Coglianese entertains fans heading to a Grateful Dead concert at Soldier Field on July 3, 2015 in Chicago, Illinois. The show is one of three scheduled to be held in Chicago this weekend to mark the end of the band's 50 years together.   (Getty Images/AFP)

Grateful Dead fans wait for the gates of Soldier Field to open for one of the band's final shows on their 50th anniversary tour on July 3, 2015 in Chicago, Illinois. The show is one of three scheduled to be held in Chicago this weekend to mark the end of the band's 50 years together.   (Getty Images/AFP)

Grateful Dead fans wait for the gates of Soldier Field to open for one of the band's final shows on their 50th anniversary tour on July 3, 2015 in Chicago, Illinois. The show is one of three scheduled to be held in Chicago this weekend to mark the end of the band's 50 years together.  (Getty Images/AFP)

Tamara Gray waits with other Grateful Dead fans for the gates of Soldier Field to open for one of the band's final shows on their 50th anniversary tour on July 3, 2015 in Chicago, Illinois. The show is one of three scheduled to be held in Chicago this weekend to mark the end of the band's 50 years together.  (Getty Images/AFP)

Hope Dean (L) and Dylan Kader play for Grateful Dead fans as they wait for the gates of Soldier Field to open for one of the band's final shows on their 50th anniversary tour on July 3, 2015 in Chicago, Illinois. The show is one of three scheduled to be held in Chicago this weekend to mark the end of the band's 50 years together.  (Getty Images/AFP)

Fans at the opening night of the Grateful Dead Fare Thee Well concert are greeted with over 50,000 beautiful red roses and a special commemorative tags from FTD and Madison House Presents at Soldier Field on Friday, July 3, 2015, in Chicago, Ill. (AP)

Bruce Hornsby, from left, Jeff Chimenti, Mickey Hart, Bob Weir, Phil Lesh, Bill Kreutzmann, Trey Anastasio of The Grateful Dead perform at Grateful Dead Fare Thee Well Show at Soldier Field on Sunday, July 5, 2015, in Chicago, Ill. (Invision for the Grateful Dead/AP Images)

Trey Anastasio, from left, Phil Lesh, Bob Weir of The Grateful Dead perform at Grateful Dead Fare Thee Well Show at Soldier Field on Saturday, July 4, 2015, in Chicago, Ill. (Invision for the Grateful Dead/AP Images)

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