With very particular characteristics, choral books consist of a series of materials that coexist in a typology of books influenced by its large format and weight. The interplay and variety of the elements used, their morphological characteristics and a number of extrinsic and intrinsic causes of degradation, occur repeatedly in these volumes. The lack of research and in depth, especially the Spanish choir books, has led us to address the draft study, knowledge and disseminate the knowledge generated for recognition and value as cultural heritage in danger.