Yesterday morning, Foo Fighters launched a mysterious clock on their website, counting down to 11/22, right around midnight. We still have no idea what’s going on — new music? New Sonic Highways? — but they’ve just added a few more clues. The site now also features a new background, depicting a large tree in some location that I don’t recognize, and a new soundtrack, a 3-minute looped audio clip of ambient, atmospheric electric guitars. As Foo Fighters fan site Foo Fighters Live points out, the ID tag on the MP3 file reads “2nd century AD,” which could be a song title, or…something else? Any ideas?