There’s a growing list of veteran pop and rock acts who’ve announced an end to touring — Paul Simon, Joan Baez, Elton John — and we can now add another: John Mayall. The godfather of the British blues scene, who will turn 88 next month, has announced an end to his “epic road-dog days”: “I have decided, due to the risks of the pandemic and my advancing age, that it is time for me to hang up my road shoes,” he says.