Boulez earned money by giving maths lessons to his landlord's son and playing the ondes Martenot (an early electronic instrument), occasionally deputising in the pit orchestra of the Folies Bergère.
Boulez earned money by giving maths lessons to his landlord's son. He also played the ondes Martenot (an early electronic instrument), improvising accompaniments to radio dramas and occasionally deputising in the pit orchestra of the Folies Bergère.