Vaillo began his music career scoring short films like 'Upside Down' (2002) and 'El negre és el color dels déus' (2003). In 2004 scored his first feature film, the thriller 'El Habitante Incierto' (The Uninvited Guest) directed by awarded director Guillem Morales.
Vaíllo is also founder and conductor of Morpheus Ensemble, contemporary music group, dedicated to perform film scores. Live concerts include original music for silent films by W. Ruttmann, L. Moholy-Nágy and S. de Chomón in different programmes.
Lecturer of Film Scoring (composition) at ESMUC (Escola Superior de Música de Catalunya). He also teaches Digital Audio, Trailers, Audiovisual Production and Storytelling at UVic (University of Vic) and has taught communication at UPF.