This international music festival, held at Barcelona's Palacio de la Musica in October 1967, was announced with a series of eight-sheet billboards. The posters, by 25 distinguished Spanish graphic artists, were exhibited outdoors in the city's Ramblas park. Four years later, the designs were reproduced in this smaller one-sheet format. This image for the second concert in the festival is an abstract design whose rhythms and rich hues suggest the modern sonorities of the program. Bas Lopez is a Barcelona native who has been working as an independent graphic artist since 1964, the same year he was appointed professor of advertising art at one of the city's major art institutes.