Just how is Harmonix handling Green Day: Rock Band? They may be doing most of the work, but they’ve partnered with some other companies to help lessen the burden. Both Demiurge Studios and design firm MK12 are on-board. Demiurge worked on Rock Band DLC track packs, and MK12 handled the cinematics on The Beatles: Rock Band. Sounds like a pair of devs worth teaming with!