<![CDATA[The growing role of non-state actors in international relations has transformed the practice of public diplomacy, allowing cultural actors to contribute to the promotion of national image beyond formal state institutions. This study examines how Voice of Baceprot (VoB), an Indonesian heavy metal band, conducted public diplomacy through its participation in the 2024 Glastonbury Festival. Using a qualitative descriptive approach, this research draws on primary data obtained through interviews with Voice of Baceprot's management and secondary data from academic publications, official documents, international media reports, and festival documentation. Data were analyzed using the interactive model of Miles, Huberman, and Saldaña. The study employs Nicholas J. Cull's Public Diplomacy Theory, focusing on the dimensions of cultural exchange and advocacy, alongside the concept of non-state actors as its analytical framework. The findings demonstrate that Voice of Baceprot functions as a non-state actor capable of conducting public diplomacy through international music festivals. Within the cultural exchange dimension, the band facilitated intercultural interaction by presenting Indonesian identity through music performances, engaging with international audiences, and exchanging experiences with musicians from different countries. Meanwhile, in the advocacy dimension, Voice of Baceprot utilized Glastonbury Festival 2024 as an international platform to promote Indonesia's cultural diversity, professionalism, and contemporary creative industry, thereby contributing to the development of a positive international image of Indonesia. These findings indicate that international music festivals have become effective arenas for non-state actors to complement Indonesia's public diplomacy efforts in the contemporary global environment.]]>
