Olivier Degen has moved for years among musicians, concerts and the world of jazz, and his work bears witness to a complicit immersion. The black and white faces of jazzmen and jazzwomen offered here, each with a delicate caption line giving the identity, the place and the time, invite us to take ours in browsing these concentrated, mischievous, joyful expressions, punctuated by the little background music of Francis Marmande's poem.