Béatrice Thiriet discovered her passion for music very early on.Trained at the Conservatoire de Versailles, she went on to study composition and musical analysis. Her musical vocation, an attraction for writing and her interest in the theatre and the cinema very quickly led her to film music. Opera and cinema are her favourite fields. In 2000, as a laureate of the Beaumarchais Foundation, she created a chamber opera, Nouvelles Histoires d'Elle, at the XXth Theatre in Paris. Discovered in the cinema by Pascale Ferran, she composed the original music for all her films, Petits arrangements avec les morts, L'âge des possibles, Lady Chatterley and Bird People. She has collaborated with many feature film directors: Anne le Ny, Dominique Cabrera, Brigitte Sy, Marc Esposito, Jacques Deschamps, Eyal Sivan, Joel Farges, Radu Mihaileanu, Jérôme Diamant-Berger. Also a director, she has made two short musical films: Portrait de lettres with Chœurs and La lettre de Mourad (broadcast on France 2 and Mezzo). As a music critic, she has collaborated on the France Musique programme Le Pavé dans la mare.In 2007 she proposed and presented a special programme on Radio Classique Femmes de musique every Wednesday. In 2013 she created the opera Jours vénitiens, produced during her residency at the Centre de Création National de Pigna in Corsica. In 2022 creation of Avoceru musical drama at the national creation centre of Pigna in Corsica.