Swedish pop and rock music producers have contributed to major international successes in recent decades. Despite this, only a few researchers have studied the professional knowledge of these producers and what they do in their work. What producers do and their knowledge is something of a black box. Understanding producers' professional knowledge is essential for future producers, decision-makers and educators to create the conditions for tomorrow's success. However, what are the core competencies and skills apart from technical expertise? What is in the black box? This study mainly focuses on how producers communicate with musicians, artists, and other producer colleagues. These are the research questions: What characterizes explicit communication verbally or in other ways? Is there implicit communication, and how does it differ from explicit communication? Which communication is necessary and which is superfluous? Is there communication that can hinder a fruitful process during a music production session? Are there innovative multimodal communication methods that are particularly useful in music production? How do different producers use different communication strategies? Theoretically, this research rests on several legs. First, Kurt Blaukopf's music sociology is an interdisciplinary approach rather than a discipline (Blaukopf, 2003; Blaukopf & Zembylas, 2012; Smudits, 2019). Blaukopf devoted most of his professional life to formulating and practising in various fields, focusing on music as music activity, the desire for music and musical autonomy in shaping and changing complex conditions of existence. This sociology of music is complemented by other theories and theorizations, such as Howard Becker's contributions to the understanding of art worlds (Becker, 2008), Robert K. Merton's theoretical theme on opportunity structures (Merton, 1996), Jennifer Lena's and Rickard Peterson's models on how music cultures and genres evolve (Lena & Peterson, 2008), Ronald F. Inglehart's work on people's values and behaviours (Inglehart, 2018). Since creativity is a concept often referred to as a quality marker or authenticity indicator in music production, Harrison C. White's work with careers and creativity in music and music creation and artistry (White, 2008, 2020) and theories of creativity in music production is developed by Paul Thompson (2016, 2019) and Phillip McIntyre (2011, 2012, 2018) as well as various theories of authenticity further essential starting points. This paper aims to report results from observational studies and interviews with active music producers included in the project. One observation from the data we collected is that there are apparent similarities between how producers give instructions and guidance to how teachers work in music education and the supervision of students in higher education. However, the knowledge music producers use in their daily practice regarding communication with others tends to be based on personal experience after trial and error or on imitating how important predecessors and leaders in music production have acted. As a result, there are considerable variations in how different producers react. However, the common thing is that few bases their work on previous research on feedback and supervision, but they may have a lot to gain by trying it.