This paper proposes an experimental framework for exploring music-driven flashmobs in urban spaces as tools of artivism. Artivism, understood as the strategic integration of artistic practice and activism, harnesses creative expression to engage communities, challenge social norms, and amplify marginalized voices. This paper suggests using original musical compositions performed spontaneously in public urban settings to provoke reflection, participation, and social dialogue. The proposed experiment draws on the Urban Cultural Resistance Music Pedagogy (UCRMP) theory, which emphasizes music as a vehicle for critical consciousness, social awareness, and collective action. Flashmobs function as ephemeral, participatory interventions that interrupt routine urban life, transforming ordinary spaces into sites of aesthetic and civic engagement. The study outlines a methodology in which performers enact thematic musical pieces addressing social issues while observing audience responses, documenting interaction patterns, and analysing potential impacts on public perception and engagement. Theoretical analysis suggests that the multisensory and communal qualities of music can foster empathy, solidarity, and awareness, aligning with artivist goals of education and social transformation. By conceptualizing urban musical flashmobs through a UCRMP lens, this paper provides a framework for experimenting with music as an accessible, context-sensitive medium for civic engagement. It contributes to scholarship on experimental performing arts, proposing innovative methods for embedding activism into everyday urban life while offering practical guidance for artists, educators, and cultural practitioners seeking to translate social theory into performative action.