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This article describes the vibratory as observed in a cello-mediated group with adolescents with autism. It constitutes the group clinical perspective of the author’s thesis. The choice of co-therapy and the use of this mediation are aimed at specifically welcoming the vibratory phenomenon. A detailed analysis of the vibratory phenomenon as it manifests itself in the group clinical situation and with the support of the transference /countertransference interplay will form the basis of reflection for putting forward a conceptual model of the vibratory as a psychic process. As a process, it is part of the primal register and represents one of the basic experiences enabling the subject to create initial representations of the world-environment from which he or she is not yet differentiated. In the context of a therapeutic group made up of autistic people, the vibratory makes it possible to focus on the somato-psychic register that fosters linking and supports the creative capacities of each subject.