The Arcade Fire’s new album, The Suburbs, is their Joshua Tree. They are the hipster U2. Of course, this could mean that in another decade or so they’ll be playing stadiums packed with 40somethings while the young hipsters are doing something else. But that’s ok. Things change. Tastes are fickle. Nothing lasts except memories and nostalgia. In the future, we’ll remember the time we saw Arcade Fire play at the Hollywood Bowl in quaint old 2005, when “Wake Up” galvanized us fresh-out-of-college idealists and gave us something to spur us on in our awkward entrance into adult existence. We’ll remember it with laughter and tears, marveling at how fast the world went from there.