This study investigates the usability and functionality of playlist management features within mobile music streaming platforms, focusing on Spotify, Apple Music, and SoundCloud. While playlists are a core component of user interaction with streaming services, limited research has examined how users engage with these features from an interface design perspective. The research adopts a Research through Design (RtD) approach, wherein Design Thinking serves as a guiding method for the design process. By combining a pilot survey, precedent analysis, design proposal, and user evaluation, the study aims to explore the relationship between design and functionality in playlists. The pilot survey identified playlists as a highly valued feature, guiding the analysis of the three selected platforms. A precedent analysis was conducted to compare each platform’s playlist interface and identify usability challenges related to playlist management. Based on the analysis, a design proposal was developed to address the identified limitations. Key improvements included a clearer visual hierarchy, enhanced user control, and improved visibility of the system. A second survey was conducted to evaluate the proposed design in comparison to Spotify’s current interface. The findings indicate that enhanced functionality alone is insufficient to improve the user experience if not paired with an intuitive and visually appealing design. The study is limited in sample size, lowering the amount of collected data and reducing the generalizability of the results. Despite these limitations, this study contributes to the field of Human-Computer Interaction by offering insights into playlist design and highlighting the importance of balancing usability, functionality, and aesthetic appeal for user experience design.