"A escrita para percussão" is a specialized book that focuses on the notation for percussion in the music of Brazilian composers from the Grupo Música Nova. Founded in 1963, this collective of artists has played a significant role in the avant-garde music scene. The book examines the innovative graphic elements used in the scores and highlights how these elements are borrowed from the visual arts. It analyzes how these new forms of notation represent resources of indeterminacy and improvisation and how they contribute to the exploration of new timbres. Additionally, it addresses the integration of typical Brazilian percussion into the experimental music of that time. This comprehensive analysis is aimed at anyone interested in the challenges and developments of musical notation in contemporary music.