After 20 years of turbulent friendship, the relationship between Brahms and Joseph Joachim finally snapped at the beginning of the 1870s. But for once it wasn't the fault of the infamously rude and argumentative composer. Donald Macleod explores the story of one of Brahms's most noble actions - his support for Joachim's wife in their tumultuous divorce case. He also introduces complete performances of solo sonatas for violin and cello, as well as a rare love song for alto, viola and piano, sung by Kathleen Ferrier.