At a time in rock and pop history where most things in music have been done before, few artists have proved as restlessly innovative over the past two decades as Beck. Since bursting onto the scene in 1994 with 'Loser', he has zigzagged his way across the contemporary music landscape, consistently remaining one step ahead of expectations and doing things his own way: shape-shifting from indie icon to pop crooner, from folk hobo to Latino-rap hipster,...