Since prehistoric times, music-making has been closely tied to the social context and emotion- and mood-regulation. In other words, musical activities produce a sense of enjoyment and exhibit specific desirable outcomes on subjective well-being. Thereby, people choose activities autonomously, based on their personal preferences and their specific set of skills. This study aims to define relations between choral singing, affect and the experience of flow, whose basic assumption is an optimal challenge-skill balance. Participants are choir members (N=50), and the research design used is quasi-experimental in which two intrinsically different situations are investigated – rehearsal and performance. Pre- and post-measures are obtained to understand the effects of choral singing on PANAS measures of positive and negative affect. Following music-making, flow was examined using a questionnaire that measures individual and group flow. Additionally, some variables that show associations with both measures have been considered, namely satisfaction, performance anxiety and a sense of community, which were assessed by single-item scales. Results indicate that positive effects of singing on affect (increase in positive and decrease in negative affect) are limited to the performance condition, while flow can be observed across both situations, but performance situation yields a greater effect. The rest of the variables displayed correlational patterns that were almost as expected: positive affect, satisfaction and community were positively correlated to flow, negative affect had a negative association, and performance anxiety did not show any associations.