 While composing some works in an accessible, tonal style, in other pieces he developed toward a serial technique, which emerged fully with the Septet for five winds, violin, and double bass (1952) .In 1948 Van Baaren became director of the Conservatoire of the Amsterdam Muzieklyceum Society (later merged into the Conservatoire of Amsterdam).In 1953 he was appointed director of the Utrechts Conservatorium.