A regular guest at Covent Garden, recent roles in the house have included Contessa Almaviva Le nozze di Figaro, and Mimi La bohème. Her Metropolitan Opera appearances include Susanna Le nozze di Figaro and Zerlina Don Giovanni.  At the Bayerische Staatsoper, Munich she has sung Ginevra Ariodante and Ilia Idomeneo. Elsewhere, she has sung Despina at the Deutsche Staatsoper, Berlin; Ilia for the Dutch National Opera and Romilda Xerxes, Ginevra and Governess The Turn of the Screw for the English National Opera.  A favourite at the Welsh National Opera, her roles for the company have included the Marschallin Der Rosenkavalier, Mimi, Contessa Almaviva, Liu Turandot, Pamina, Ilia, Angelica Orlando and Gretel Hänsel und Gretel.

Concert appearances include the Salzburg, Edinburgh, Tanglewood and Ravinia Festivals and she is a regular guest at the BBC Proms.  A Grammy Award winning artist, she has recorded prolifically.

Rebecca is a Trustee of the Colwinston Charitable Trust and patron of several charities, among them Shelter Cymru, Ty Hapus and Music in Hospitals Cymru/Wales.