Design a Music Streaming Service like Spotify

Functional Requirements:

• User Registration and Login: Users can create accounts, log in, and manage their profiles.
• Music Library: Users can browse and search for songs, albums, and artists.
• Music Streaming: Users can stream songs on demand.
• Playlist Management: Users can create, edit, and delete playlists.
• Song Search: Users can search for songs by title, artist, or album.
• Recommendations: Users receive personalized song or playlist recommendations.
• Offline Mode: Users can download songs or playlists for offline listening (for premium users).
• Cross-Device Sync: User data (playlists, liked songs) is synced across devices.

Non-Functional Requirements:

• Scalability: The system should support millions of users and songs.
• High Availability: The service should be available with minimal downtime.
• Low Latency: Streaming and search should have low response times.
• Security: User data and streaming content must be protected.
• Data Consistency: User actions (e.g., playlist updates) should be reflected accurately across devices.
• Reliability: The system should handle failures gracefully and recover quickly.
• Usability: The interface should be intuitive and responsive.