The Avett Brothers, courtesy. The Avett Brothers may get bumped up to headline the opening night of BottleRock Napa Valley on Thursday, following Furthur’s cancelation. Yesterday I chatted with Seth Avett about his band, the Americana movement (Is it on the decline? He thinks it might be) and how…

The Avett Brothers interviewed at BottleRock Napa Valley on May 10, 2013. Roman Gokhman/STAFF. Unlike their predecessors Bob Dylan or Johnny Cash, the Avett Brothers of North Carolina don’t write songs about characters in faraway places. Seth and Scott Avett stick to songs about themselves. BottleRock Napa Valley 2013…