Call them the concert illuminati. You’re at a show in an arena or stadium, watching Bruce Springsteen, Chris Stapleton, Coldplay, Madonna, or Weezer, when suddenly the darkness is dotted with dozens, hundreds, then thousands points of light — all from cellphones. The origin story of this concert ritual is a bit vague, but a new Bob Dylan collection offers one possible answer.

Last week, Dylan and the Band’s 1974 tour was commemorated with The 1974 Live Recordings, a hernia-inducing box set of more than two dozen shows recorded during that run.