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In this article the author sets out to highlight the place and function of sound and music within the process of adolescence. After a theoretical discussion of Didier Anzieu’s notion of “sound development”, the author illustrates, by means of a theoretical and clinical articulation, the extent to which the sound envelope is attacked during adolescence and how it can resist, while reorganising itself, thanks to music. Finally, the author puts forward the hypothesis that the emergence of multivocal listening in adolescence implies a reorganisation of the internalization of the “Family Vocal Group” (É. Lecourt) which is necessary if the subject is to be able to mourn his or her internal parental objects. This hypothesis is illustrated by the clinical vignette of a 16-year-old adolescent girl within a “group analytic musicotherapy” setting, showing that it is possible in this way to offer a therapeutic response to the stumbling-blocks of these pubertal reorganisations.