L-O-L
What do you mean DLC model that actually worked? They both started selling packs, then moved to individual tracks. What about it "didn't work" - motherfuckers makin up shit.
Rock Band started the individual track model WAY before Guitar Hero did. And on top of that Rock Band had the added perk of being able to import previous games songs and DLC tracks into the newer version of the game. Again, way before Guitar Hero started doing it.