Grace Petrie, Summerhall, Edinburgh review - songs of solidarity
    
      
  
  
  
Protest songs for survival at twice-rescheduled show
“How to explain Theresa May?” Grace Petrie muses from the Summerhall stage as she introduces decade-old opener “Farewell To Welfare”. “Well, in 2010, she was as bad as we thought it was going to get.”