Sandrine Piau, David Kadouch, Wigmore Hall review - the joy is in the detail 
    
      
  
  
  
Superb pianist and programme-builder in perfect partnership with the great soprano
“It mustn’t be a surface thing. You have to put in the work,” Janet Baker once said. Sandrine Piau’s Wigmore recital of German song followed by French song was the perfect demonstration of that credo in action.