When we saw that the hip-hop producer and Ninja Tune label mainstay Blockhead was going to headline a DJ showcase at Paper Box on Saturday night, we felt a little bit of perverse curiosity to see whether or not would his live performance be underwhelming.  His latest release, Interludes After Midnight, as well as the excellent Music Scene from 2010 are ponderous down tempo affairs, seemingly better suited to a quiet solitary walk home from the subway station than to the cavernous and graffiti-inspired chic of the Paper Box performance space.