Music groups from Valencia and choirs from Catalonia are two phenomena of amateur musical associationism that are references both nationally and internationally. This article, based on an exhaus-tive multidisciplinary bibliographical review, is a descriptive study that aims to show how the sociocul-tural functions that these two types of groups play have progressively increased in quantity and quality since the beginnings of the phenomenon to the present. We carried out a historical retrospective review showing how these associative musical phenomena have evolved in each region from their origins until their current peak and splendour. This progress is supported by 547 bands in Valencia and more than 900 choirs in Catalonia, which have become over the years a cultural, social, educational and patrimonial reference of identity.