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The Foo Fighters website is causing more speculation among fans. The band put an unexplained countdown clock up last week but over the weekend, the background has changed. 

The countdown still expires on November 23rd but the background image went from a statue to a tree with what appears to be a park behind it. And the background audio, which at first had just voices, now features music.

The Foo Fighters Live Twitter account, which is maintained by fans, claims the track's audio file is called "2nd Century AD."  

Many are speculating the countdown has something to do with a Sonic Highways sequel after the band's producer, Butch Vig, recently said he thinks it will happen in the summer of 2016.