“I don’t even know how to start this,” Adele wrote in an online letter to fans on 30 June. The previous night, she had played the second show of a sold-out, four-night residency at Wembley Stadium. These dates, in front of audiences of 98,000, were supposed to be the triumphant conclusion of her record-setting, 123-date world tour. But on stage, something had just felt wrong. [more...]