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Balinese Gamelan is a popular traditional musical instrument that is admired by international residents due to its fast musical rhythms. In this study, the focus will be on one object of the Balinese gamelan musical instrument, namely the gangsa. The purpose of this study was to find out the mathematical concepts found in Balinese gamelan instruments, especially the gangsa. This type of research is qualitative research with an ethnographic approach. The subject of this research is the head of Tabuh UKM STANA, a student activity unit engaged in the arts at Mahasaraswati University Denpasar. Literature review, observation, interviews, and documentation were used to collect data, which was then analyzed and identified mathematical concepts contained in the gangsa musical instrument so that conclusions could be drawn. Based on the research results obtained through observation and interviews, it can be seen that the size and playing of the gangsa musical instrument have a mathematical concept. The mathematical concepts that we find in the gangsa musical instrument are the concepts of arithmetic sequence patterns and repeating patterns. The conclusion of this study is that there is a relationship between bronze musical instruments and mathematics learning so that this can be used as an alternative medium for learning mathematics. [ABSTRACT FROM AUTHOR]