Soprano, viola and piano are probably not a combination that springs to mind when one first thinks of chamber music. However, there is a long tradition of great singers performing salon type songs with an obbligato instrument: Enrico Caruso with Mischa Elman, Marian Anderson with William Primrose; even Bing Crosby and Jascha Heifetz! Since 2011 the stellar artists known as the SPA Trio have continued this tradition.