The aim of this study is to develop a deeper understanding of what it means to be an expressive and interactive pianist, and expand those skills in duo performance with a vocalist. The research questions that guides the project are: In which ways can I deepen and enhance my expressive skills as a pianist? In which ways does the arrangement process affect our joint expression in duo performance? How can our interactions in performance become further developed into a shared voice? The structure of the results chapter is organized as I present the process behind searching for answers to each research question. The results, though, have emerged simultaneously, which has made the reflections lead to a deeper understanding of expressiveness and interactiveness.  The main artistic methods have been improvisation and transcription. Improvisation for reflecting on my already possessed knowledge and as a way of interpreting the score.  Transcription to find new ideas and new ways of applying the ideas. Stimulated recall and open coding have been used both as a way of creating arrangements and to analyze the joint expressions and interactions in the musical outcome.  The project emerged in collaboration with Sofie Andersson (2022) as we created arrangements on three songs, recorded them, and analyzed the interactions and joint expressions. The arrangement process, starting by a verbal collaborative interpretation of the lyrics, contributes to our joint expression as we listen-through-Hera (our duo) and how we want Hera to express the intended interpretation. By communicating verbally and non-verbal, we could understand each other's interpretations and find a joint expression. We found that trust is a key to a successful collaboration. The way we interact attentively to each other's voice and impulses, and the way we are part of each other's extended body schema creates our shared voice.