The well-appointed music fan doesn’t venture out to a concert with the modern cell phone. “At times, the atmosphere was more like a high-Catholic service than a pop concert. In the velvety dark, 10,000 points of polychrome light glimmered as cellphone screens were lit and turned, reverently, towards the stage. A sizeable part of the audience was photo- and sound-recording the event, and another sizeable part of the audience was transmitting Coldplay’s performance to absent friends via mobile phones.”