The abstract for a music application in React JS and Firebase would describe a software solution for streaming and sharing music that utilizes the React JavaScript library for the frontend and Firebase as the backend service. The application would provide users with access to a vast music library and allow them to create personalized playlists, share music with others, and discover new artists and genres. The React framework would enable a responsive and intuitive user interface, while Firebase's real-time database and authentication services would provide a secure and scalable backend infrastructure. The application would leverage modern web technologies to provide a seamless and enjoyable music streaming experience for users across different devices and platforms.