The man’s face looks as though it’s been carved, like we used to do in primary school. Carving in linoleum, rolling ink over it, and then printing. It seems to be the face of a Black man, and near the place where this face is found, there’s also a jazz club. Hence the name: Jazz. It’s beautiful how the man’s face seems to lift off from its background, with the paper slightly curled at the top right.
Jazz was created elsewhere, in America, and became popular mainly in the 1930s and 40s. Now considered an old-fashioned genre, back then it was seen as a wild and dangerous temptation. Valencia still has several jazz clubs, and there’s at least one annual festival.