Once upon a time, back in the guitar-friendly nineties, Oasis and Blur hated each other. (There’s a famous Noel Gallagher quote about how he wished Blur’s Damon Albarn would “get AIDS and die.â€) But 2013 is the year of peace — at least for Noel and Albarn, who have been saying nice things to each other for a while now and finally shared a stage (along with Graham Coxon) at a charity concert over the weekend. Liam, meanwhile, offered a particularly Gallagher response: “Don’t know what’s worse sipping champagne with a war criminal or them backing vocals you’ve just done for BLUE!†(He means Blur.)