Welcome to this week’s Release Round-Up! Tom Petty, An American Treasure (Reprise) 4CD: Amazon U.S. / Amazon U.K. / Amazon Canada 6LP: Amazon U.S. / Amazon U.K. / Amazon Canada 2CD: Amazon U.S. / Amazon U.K.  / Amazon Canada  This career-spanning retrospective of rare and previously unreleased material from the late Tom Petty arrives on Reprise Records.  The aptly-titled An American Treasure will be the first posthumous collection of Petty material, and it should prove a vital reminder of the power of Petty’s art.  The box set, assembled by Petty’s wife Dana,…