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PHILADELPHIA, PA - JULY 25: Singer-songwriter Paul Simon performs on stage during the first day of the Democratic National Convention at the Wells Fargo Center, July 25, 2016 in Philadelphia, Pennsylvania. An estimated 50,000 people are expected in Philadelphia, including hundreds of protesters and members of the media. The four-day Democratic National Convention kicked off July 25. (Photo by Chip Somodevilla/Getty Images)

PHILADELPHIA, PA - JULY 25:  Singer-songwriter Paul Simon performs on stage during the first day of the Democratic National Convention at the Wells Fargo Center, July 25, 2016 in Philadelphia, Pennsylvania. An estimated 50,000 people are expected in Philadelphia, including hundreds of protesters and members of the media. The four-day Democratic National Convention kicked off July 25.  (Photo by Chip Somodevilla/Getty Images)

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GLASTONBURY, ENGLAND - JUNE 26: Paul Simon performs live on the pyramid stage during the Glastonbury Festival at Worthy Farm, Pilton on June 26, 2011 in Glastonbury, England. The festival, which started in 1970 when several hundred hippies paid 1 GBP to attend, has grown into Europe's largest music festival attracting more than 175,000 people over five days. (Photo by Ian Gavan/Getty Images)

GLASTONBURY, ENGLAND - JUNE 26: Paul Simon performs live on the pyramid stage during the Glastonbury Festival at Worthy Farm, Pilton on June 26, 2011 in Glastonbury, England. The festival, which started in 1970 when several hundred hippies paid 1 GBP to attend, has grown into Europe's largest music festival attracting more than 175,000 people over five days.  (Photo by Ian Gavan/Getty Images)

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NEW YORK, NY - OCTOBER 06: Paul Simon performs onstage at The Country Music Hall Of Fame & Museum All For The Hall New York Benefit Concert at PlayStation Theater on October 6, 2015 in New York City. (Photo by Michael Loccisano/Getty Images for Country Music Hall Of Fame)

NEW YORK, NY - OCTOBER 06:  Paul Simon performs onstage at The Country Music Hall Of Fame & Museum All For The Hall New York Benefit Concert at PlayStation Theater on October 6, 2015 in New York City.  (Photo by Michael Loccisano/Getty Images for Country Music Hall Of Fame)

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LONDON, ENGLAND - NOVEMBER 07: Paul Simon performs at Royal Albert Hall on November 7, 2016 in London, England. (Photo by Samir Hussein/Getty Images)

LONDON, ENGLAND - NOVEMBER 07:  Paul Simon performs at Royal Albert Hall on November 7, 2016 in London, England.  (Photo by Samir Hussein/Getty Images)

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PHILADELPHIA, PA - JULY 24: Musician Paul Simon walks on stage during the setup of the Democratic National Convention at the Wells Fargo Center, July 24, 2016 in Philadelphia, Pennsylvania. An estimated 50,000 people are expected in Philadelphia, including hundreds of protesters and members of the media. The four-day Democratic National Convention kicks off July 25. (Photo by Drew Angerer/Getty Images)

PHILADELPHIA, PA - JULY 24:  Musician Paul Simon walks on stage during the setup of the Democratic National Convention at the Wells Fargo Center, July 24, 2016 in Philadelphia, Pennsylvania. An estimated 50,000 people are expected in Philadelphia, including hundreds of protesters and members of the media. The four-day Democratic National Convention kicks off July 25.  (Photo by Drew Angerer/Getty Images)