Great post! i concur with your analysis according to Buber...
Between musicians and the public there is a mystery space, where the musicians do not enter nor the public but the 2 are transformed by the felt space of meaning, spontaneously created, by those playing and by those listening, a space from which their consciousness is excluded .
@mahgister. Your comment that between musician and audience is very often not related I suppose could apply to any creative work! And I would agree. The in between time-space that Martin Buber speaks to in “I Thou” and his I It I think convincingly expresses that mysterious experience where both participants are changed as a result, but not in any preconceived way. Being unrelated is in my opinion not only true oftentimes but also irrelevant.