This study aims to deconstruct the transformation of radio across its historical trajectory into an Audio Unbound entity within the contemporary digital ecosystem. Employing a Systematic Literature Review (SLR) approach with historical-technological and sociological perspectives, this research analyzes the evolution of radio from the analog era to algorithm-driven platforms. The findings reveal that radio transformation occurs through four main phases: analog spectrum hegemony (AM), specialization and mobility (FM and transistor), the deconstruction of curatorial authority through digital algorithms, and the democratization of distribution via RSS protocols and podcasting. The study demonstrates that radio has undergone an ontological redefinition: it is no longer determined by frequency, transmission devices, or linear broadcasting schedules, but by personalized audio experiences curated algorithmically and distributed in a decentralized manner. RSS protocols have dismantled barriers to entry in the audio industry, while digital algorithms have shifted curatorial authority from institutions to individuals. This research concludes that radio has evolved into Audio Unbound, a non-linear, inclusive, and participatory audio medium. These findings imply that the broadcasting industry must adapt to data-driven distribution models and strengthen engagement within niche communities in the digital media ecosystem.
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