Negative Frequencies Philadelphia the harder darker styles of dubstep,drum&bass, and hardcore Negative Frequencies’s tracks FREQ_CAST002 MIXED BY RIP REED by Negative Frequencies published on 2011-02-04T17:02:43Z FREQ_CAST001 MIXED BY KNIGHTMARE by Negative Frequencies published on 2011-01-01T17:22:16Z OMAR-HARDCORE INDUSTRIAL MIX June 2009 by Negative Frequencies published on 2010-02-21T19:32:25Z