It’s probably safe to assume that most of us have wanted to be a rock star at some point in our lives. The impulse is usually fleeting, however, and instead, we embrace the ritual of vicariously basking in the glory of the genuine article, the sort of glory that borders on rapture. It’s been said a gazillion times, but the comparison is apt: Rock concerts really can be full-blown religious experiences, with a different sort of dogma — thousands of strangers worshiping together at the feet of a Christlike deity who howls like a banshee and most likely wears very tight trousers. Why have we loved them so? “They did things you didn’t dare do with people you would never meet in places you could never afford to go,” David Hepworth writes in “Uncommon People: The Rise and Fall of the Rock Stars.” “Our favorite rock stars weren’t mere consumer preferences. They were markers of our identity….” Yet even as the author commemorates rock star majesty, he acknowledges an extremely inconvenient truth: It’s over. The music has died. The age of the golden god has run its course. Sure, a few proud 70-plus ax-wielding geezers — Paul McCartney, Neil Young — still roam the Earth. And while their shows may be inspiring and sometimes even great, they’re also a painful reminder of a final fade to black. When the remaining septuagenarian gods shuffle into the permanent twilight (joining Lemmy, Prince and Bowie), they’ll be taking their era with them, and only their holograms will remain. Fantality Corp. Janis Joplin. Janis Joplin. (Fantality Corp.) “Uncommon People” really sings when Hepworth connects rock ’n’ roll’s evolutionary dots. The British music journalist and former presenter on BBC’s “Old Grey Whistle Test” chronicles rock’s most pivotal stars and moments from 1955-95, focusing on make-or-break flashpoints, including Buddy Holly’s plane crash, Janis Joplin at Monterey and Live Aid. As the book moves methodically through rock’s often sordid history, patterns begin to develop, as the layers of rock star template are unpeeled, revealing both its evolution and eventual de-evolution. In some cases, there is little insight that can be added. What hasn’t already been said about the