Strongly present in human trajectory, music has always had its place of honor as the language of emotions. This dissertation aimed to amplify this concept and ponder about said language in its potential of sense unveiling, particularly in the treatment of adults with deficiency. This work discussed the role of the patients musical production as legit manifestation of cognitive, aesthetic, cultural, life and communication content, with music being a concrete possibility for these adults to read into reality - and, as interactive players, to put themselves in it. Questions such as human development and deficiency, music therapy, language and musical improvisation were part of a theoretical foundation which, inside the clinic of the adult with deficiency, validated the premises of integration and organization needed by this adult. The conclusion that resulted from this study is that, with its intended objectives and having the results critically analyzed, the research fulfilled its prerogative of music as therapeutic treatment and potentially promising of manifesting internal content. Furthermore, new ideas were thought out in order to optimize not only the therapeutic work with music but also provide to this population a freeing experience marked by expressive creativity and pleasure.