VARIOUS ARTISTS Crossroads Guitar Festival 2010 [Rhino] DVD REVIEW Rock ’n’ roll as a genre couldn’t exist without the electric guitar. That means Eric Clapton’s Crossroads Guitar Festival, put on by the guitar legend tri-annually since 2004, is in essence a celebration of rock ’n’ roll’s very raison d’être. For each event Clapton handpicks a lineup of axe slingers that embraces a broad range of styles and generations, from his...