Betsabée Haas pursued her vocal studies at the Royal Academy of Music of London and at the Royal Welsh College with professor J.Price.

In 2014-2015 she sang the part of Alice Ford in Falstaff, La Folie in Platée (Rameau) in Tokyo and Wellgunde in Das Rheingold .

In 2010-13 she was Papagena in Peter Brooks’ acclaimed and personal  production of Magic Flute (Une Flûte Enchantée), which toured around the world from the Piccolo Teatro in Milano to the Lincoln Center in New York and many prestigeous halls around Europe, the Americas and Asia.

In Great-Britain, she sang among others the title role in the London premiere of Hahn’s Ciboulette and the leading role in a contemporary opera, Bird of Night, first performed at the Royal Opera House. Just after graduating she sang the part of Maria in West Side Story at the Royal Opera of Malmö (Sweden).

In the early music field, she collaborates with many french baroque ensembles such as Les Talens Lyriques, Le Parlement de Musique, La Chapelle Rhénane, Consonance, Suonare e cantare.

More so, she has recorded two rather unknown operas with Harmonia Mundi-K617: Porpora's Orlando (singing the part of Angelica) and Martin y Soler's Ifigenia in Aulide (singing the part of Achille) for which she received great reviews.