Want to play with Twitter’s new music app? You can get it today — if you’re really famous. If not, you’re going to have to wait a week. Here’s the deal: As we wrote yesterday, Twitter is launching its new music discovery app for iOS devices, timed to the start of the Coachella music festival this weekend. But for now, only a handful of “influencers” are going to get their hands on it. That’s why Ryan Seacrest was tweeting about the app yesterday*. And that’s why sources say you should expect to see dozens of other celebrities chatting it up over the next few days. And you, non-famous person with an iPhone? Hang tight for a week. So that helps explain why we heard contradicting reports about the app’s launch date (Today! This weekend!) yesterday. (They were both right! Sort of.)