What I find hilarious about this is that Oasis is featured as Rock Band DLC. According to how Harmonix does their DLC-- They talk to the publisher and the band as well. The easy explanation for this is money, but why go and bash something that would be netting you some cash?
Although he did say Guitar Hero, but still, they are the same genre and I would consider a bash on GH a bash on RB.
I'm sure this has more than likely been pointed out already, but I haven't had the time to read through the topic completely.