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The Foo Fighters are sharing the guest list for their 20th anniversary extravaganza. In addition to a performance from Dave Grohl and the guys, the July 4th event in Washington D.C. will also include sets from Buddy Guy, Gary Clark Jr., Joan Jett, LL Cool J, Trouble Funk, and Trombone Shorty. 

All of the special guests have been, or will be featured in the Foo Fighters' HBO documentary "Sonic Highways."  The series continues Friday night with an episode focused on Austin, Texas. 

The band has been putting on concerts in each town on the night of that episode's premiere, but they've had to cancel their Austin appearance. A statement on the Foo Fighters' website explains that a "family matter" has forced the group to postpone their "Austin City Limits" taping until November 20th. 

In the meantime, fans can get tickets to the Foo Fighters' 20th Anniversary show this Saturday. 

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