Improve Spotify's Collaborative Playlists

Currently, users face significant friction when collaborating on playlists. The main issues include the inability to see who added what in real-time, leading to duplicate entries, and a lack of conflict resolution when multiple users add conflicting tracks simultaneously. This often results in playlist clutter and frustration during group listening sessions. To solve this, I propose implementing a 'Live Voting Queue' feature. When a user adds a song, it enters a temporary queue visible to all collaborators. Other members can vote to approve or reject the track before it is permanently added to the playlist. This ensures consensus and maintains playlist quality. The primary success metric for this feature would be the 'Collaborative Playlist Engagement Rate,' defined as the percentage of collaborative playlists that receive at least three additions within 24 hours of creation. We expect this to increase by 15% as the voting mechanism reduces friction and encourages participation. As a guardrail metric, we will monitor 'Playlist Abandonment Rate' to ensure the new workflow doesn't slow down the curation process too much, keeping it under 5%.