The infant observation presented in this paper was conducted weekly for two years. Through an extensive use of clinical vignettes and personal and theoretical considerations, this article aims to highlight that both harmonies and pauses, as well as interruptions and dissonances, can be present in early interactive exchanges, forming the fabric of a relational piece of music that is not always as harmonious as might be desirable. The role of the father in moderating problematic interactions between the mother and her child is also examined.