 As a near neighbour of Gerald Finzi's, from 1941 Wyss performed in several of his concerts involving the Newbury String Players, singing the Aria from Finzi's "Dies Natalis" as well as works by William Byrd, Henry Purcell, George Frideric Handel, Ivor Gurney, and Ralph Vaughan Williams.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.