Rosemary studied at The Royal Academy of Music and the London Opera Centre. She appeared in Pantomime at The Player’s Theatre and in the London production of The Magic Flute. She sang the role of Marie Regnault in Taverner’s Thevese at Covent Garden and played Despina in Cosi Fan Tuttefor Sir Geraint Evans’ Masterclass on BBC TV 2. She played Cunegonde in Bernstein’s Candide at the 1981 Edinburgh Festival and then at The Birmingham Repertory Theatre.