Your local prog-rock obsessive is probably pretty close to combustion at the moment: It’s only about 48 hours until Spiritualized, the high-nineties drone rockers, arrive at Radio City Music Hall to play a one-night-only concert version of their 1997 masterpiece, Ladies and Gentlemen We Are Floating in Space. The band—and Floating in particular—has earned just about every sort of accolade a rock group can get, from fawning blog love, perma-presence on critics’ top 10 lists, fancy collector’s-edition repackagings, and a tour slot with Radiohead. And on Friday, they’ll add one more laurel to their crown: a limited-edition T-shirt, designed by Helmut Lang creative director (and Spiritualized fan) Michael Colovos. Only 300 are available, and they’ll be available only at Friday night’s show. If you want one, be prepared to put up a fight.