 Wyss gave many first performances of works in French or English by composers including Lennox Berkeley, Arnold Cooke, Roberto Gerhard, Elizabeth Maconchy, Peter Racine Fricker, Alan Rawsthorne, George Enescu, Antony Hopkins and Mátyás Seiber.She was also a leading exponent in the UK of songs by Gabriel Fauré, Claude Debussy, Reynaldo Hahn, Maurice Ravel and other French composers.During a career that lasted until the early 1960s Wyss broadcast extensively for the BBC, and made concert tours in continental Europe and Australia.