As a sideman and guest musician he has played with a large number of artists in different genres, from the Willem Breuker Kollektief to Chef'Special, in clubs, theaters and festivals all over the world. Together with composer / flutist Ned McGowan, Gijs led the Karnatic Lab, a concert series, a series of festivals, a record label and a number of ensembles for many years. This organization, in which progressive musicians from different genres collaborated or presented their work, was of great significance for the Amsterdam new music scene.
Gijs Levelt composes music for his own bands and on commission for other artists and theater performances. Central to his composing process, he sets the balance between the head and the heart, and strives to make complexity accessible and to enhance apparent simplicity. For several years now, Gijs has been researching the use of effect pedals and other electronic means in combination with acoustic instruments in his compositions.