Benoit Arnould studied singing at the Conservatoire in Metz before going to work with Christiane Stutzmann at the Conservatoire in Nancy, where he obtained a gold medal. During this time he also studied the organ at Metz Conservatoire and concluded his official study of baroque singing in the early music class of Monique Zanetti, after being awarded a highly-commended gold medal in June 2003. He also obtained a Licence de musicologie at the Sorbonne University (Paris IV).
His career as a soloist began with the Academie de Musique de Porrentruy in Switzerland, conducted by Mikael Radulescu, in Bach's B minor Mass and Magnificat. He later worked with the Concert Spirituel in 2001, conducted by Herve Niquet, and took part as a member of the chorus in several pro -ductions, including Haydn's Nelson Mass, Charpentier's Te Deum, Daphnis et Chloe by Boismortier and Purcell's King Arthur, and later as soloist at the Chaise-Dieu Festival, the Chapelle Royale in Versailles; and the Festival of Sacred Music organised by the city of Paris, where he sang in the Grands Motets by Desmarest and the Miserere des Jesuites by Charpentier.
In 2004 he sang the roles of La Musique and the Marchand d'Orvietan (the quack doctor) in the comedie-ballet L'amour medecin by Moliere / Lully, produced by Vincent Tavernier. He also sang Areas and La Vengeance in Medee by Charpentier, conducted by Herve Niquet with Le Concert Spirituel at the Arsenal in Metz, the Opera Royal in Versailles, the Auditorium at Lyon and in May 2005 at the Salle Gaveau (Paris) and the Rouen opera company. He has taken part in several recordings made by the same ensemble, including Purcell's King Arthur and Boismortier's Daphnis et Chloe.
In 2005 he took part in a recording of the Grands Motets by Desmarest, where he sang as a soloist, and in La Bellissima Speranza by Stradella with Le Concert de l'Hostel Dieu. Other concert work has involved performances of Handel's Messiah, Haydn's Seasons, Mozart's Requiem, Berlioz's Enfance du Christ, Beethoven's Christ on the Mount of Olives, Faure's Requiem and Rossini's Petite Messe Solennelle.