Natalie Wheen presents the second of four masterciasses. For this programme, Radio 3 travelled to Baden earlier in the autumn to record the celebrated French soprano Regine Crespin passing on her lifetime's experience to a younger generation of aspiring singers. Her masterclass was to students from European Union Opera, who are really put through their paces by this most exacting of perfectionists as they try to come to terms with the elusive art form that is French song.