They haven’t moved to “arena rock.” They are that popular to fill up an arena like the Garden in Boston. A lot of their “fans” probably have only heard “Sex on Fire” and “Use Somebody,” two songs that have been played constantly on KISS 108. Allegations that the brother/cousin quartet are sell-outs don’t make a lot of sense. They’ve been signed to RCA since the release of their debut album in 2003. Their sound strikes a chord with the average “pop” music listener because they play an incredibly mainstream sounding garage rock. Like their major label counterpart The Strokes, they can be easily be confused as “indie” because their rhythm is comfortably between soft rock and punk.