Participation has presented a complex unit of analysis for interactional sociolinguistics. In this study I add another dimension to participation by considering recent theories related to sociocultural activity theory--mediated discourse analysis and distributed cognition. Drawing on examples from "maguru panggul", the traditional pedagogy of Balinese Gamelan music, I argue that participation structures are a mediational means that enable students to augment their learning. Focusing on two participation structures that involve keen observation and listening-in, I also consider how intent participation is a part of these participation structures and maguru panggul pedagogy. What emerges is an understanding of how participation structures used as mediational means can have an effect on the division of cognitive labor within a classroom. (Contains 5 figures.)