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SAN FRANCISCO, CA - OCTOBER 01: Musician Steve Earle performs onstage during Hardly Strictly Bluegrass at Golden Gate Park on October 1, 2016 in San Francisco, California. (Photo by Scott Dudelson/Getty Images)

SAN FRANCISCO, CA - OCTOBER 01:  Musician Steve Earle performs onstage during Hardly Strictly Bluegrass at Golden Gate Park on October 1, 2016 in San Francisco, California.  (Photo by Scott Dudelson/Getty Images)

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SAN FRANCISCO, CA - SEPTEMBER 30: Singer Steve Earle performs onstage at Golden Gate Park on September 30, 2016 in San Francisco, California. (Photo by Scott Dudelson/Getty Images)

SAN FRANCISCO, CA - SEPTEMBER 30:  Singer Steve Earle performs onstage at Golden Gate Park on September 30, 2016 in San Francisco, California.  (Photo by Scott Dudelson/Getty Images)

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SAN FRANCISCO, CA - SEPTEMBER 30: Singer Steve Earle performs onstage during Hardly Strictly Bluegrass 2016 at Golden Gate Park on September 30, 2016 in San Francisco, California. (Photo by Scott Dudelson/Getty Images)

SAN FRANCISCO, CA - SEPTEMBER 30:  Singer Steve Earle performs onstage during Hardly Strictly Bluegrass 2016 at Golden Gate Park on September 30, 2016 in San Francisco, California.  (Photo by Scott Dudelson/Getty Images)

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Steve Earle performs as part of the Songwriters Circle at the Hardly Strictly Bluegrass Festival at Golden Gate Park in San Francisco, CA (Photo by Tim Mosenfelder/Corbis via Getty Images)

Steve Earle performs as part of the Songwriters Circle at the Hardly Strictly Bluegrass Festival at Golden Gate Park in San Francisco, CA (Photo by Tim Mosenfelder/Corbis via Getty Images)

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SAN FRANCISCO, CA - OCTOBER 04: Musician Steve Earle performs on stage at The Hardly Strictly Bluegrass festival at Golden Gate Park on October 4, 2014 in San Francisco, California. (Photo by Scott Dudelson/FilmMagic)

SAN FRANCISCO, CA - OCTOBER 04:  Musician Steve Earle performs on stage  at The Hardly Strictly Bluegrass festival at Golden Gate Park on October 4, 2014 in San Francisco, California.  (Photo by Scott Dudelson/FilmMagic)