Liverpudlians Ladytron and Los Angelenos Great Northern have played at least a few shows together over the years, and now the radio-ready SoCal power-poppers have remixed latest Ladytron single "Tomorrow". In an age of increasingly superfluous cross-branding remixes, this cut from the forthcoming Tomorrow remixes EP may not break any new ground, but at least it has a raison d'être. Great Northern, a guitar outfit, retrofit Ladytron's electronic-oriented track from last year's Velocifero with crashing guitars, additional backing vocals, and some plangent piano toward the end. Simple concept, polished execution: from Ladytron to Ladyrock.MP3:> Ladytron: "Tomorrow (Great Northern Remix)"[from the Tomorrow EP and original version from Velocifero; due 03/03/09 and out now, respectively, both on Nettwerk]