Rock Band patch adds in-game store

Some time this week, Rock Band players will be able to enjoy new features and functionality through a downloadable patch. The most significant addition is the inclusion of an in-game music store. Joystiq describes it as "a fully integrated shop allowing players to preview and purchase tracks without ever leaving the comfy confines of the game." As seen in the image, each song will feature a preview, and a display of difficulty for each instrument.