Which innovative customer feedback method did Spotify introduce in 2019 that revolutionized how streaming platforms gather user preferences for algorithmic recommendations?

The music industry has undergone dramatic shifts in how it collects and utilizes customer feedback to shape product development. As streaming platforms revolutionized music consumption, the methods for gathering listener insights evolved significantly. This poll tests your knowledge about how major music platforms leverage customer feedback to enhance their services and maintain competitive advantages in the digital streaming era.

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Daily Mix Feedback Loop - where users rate recommended playlists to train the algorithm
Streaming DNA - a visual representation of listening habits that users could modify directly
Spotify Listening History Optimization - allowing full listening history deletion to reset recommendations
Taste Profile Interactive Tool - allowing users to directly adjust importance of artists and genres in their recommendations