Grégoire started music at age 5, studying jazz & classical in French conservatories. He created his first band at 11. Craving for other territories than institutional learning, he switched to electronic and indie at 20, rapidly developing his own voice. Grégoire had the chance to be involved in outstanding collaborations. He worked on 30+ albums. From the foundation of Moongaï, touring across Europe and releasing albums with Warner Music, to the direction of a collaborative pop symphony for the Centennial of WW1 in Liverpool ; from collaborations with the Manchester Camerata Orchestra to the musical direction of hundreds of comedians for gigantic open-air shows ; from regular collaborations with international pop artists such as Dj Snake or 20syl to the meeting of traditional Indian Music masters ; from motion-picture compositions to commercials. Vaillant also produced and helped to develop emerging bands. He regularly share his knowledge during conferences or teaching programs. As an obsessive creator, he is always developing personal projects. He is the founder of "The Øpera Collective", a multi-disciplinary European union of creatives people from digital arts to theater, film or chamber music. They produce large scale original & experimental shows about our time. He notably co-wrote composed and directed « Le Jeune Homme & la Nuit » a 2h Transmedia Opera. "The Happiness of Being Sad »  is a collection of work for piano and string ensemble inspired by poetry."Abraham Fogg" is an electronica project inspired by classic horror films with a modern Live A/V.