CHICAGO — It was a little after 2 a.m. when the phone began to ring in my brother Mark Kogan’s Las Vegas hotel room and that hour rarely brings good news. It was 1976, and my brother was in Vegas with the many other people who formed Elvis Presley’s entourage, all of them staying at the International Hilton, where Elvis was performing during the Christmas holidays. During the mid-1970s my younger brother was at the center of the concert business, working in various capacities with such bands and performers as Frank Sinatra, Led Zeppelin, Bob Dylan, Styx, The Beach Boys, Eric Clapton, Neil Diam…

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