Jacobus (Jacques) Jansen was mostly called Jac. Jansen. His father and grandfather were also musicians in the band of the Dutch Navy in Den Helder. His father was his first musical teacher. For some time he played flute in the Arnhem Orchestral Society, and went on to study harmony and composition at the Amsterdam Conservatory. In addition to flute, Jansen played violin and piano. Around 1930, he worked frequently for Dutch radio, mainly playing live at the studio. His works covered many musical categories: in addition to orchestra music and works for solo instrument and orchestra, he had a love for choral music. He also composed a number of operas - including children’s operas – including Rembrandt, Mariken van Nimweghen (Mary from Nimweghen) and De Friesche Bruid (The Frisian Bride). Jansen lived in Bergen in Noord-Holland. In 1954, he suffered a stroke during a concert and died.