One of the core decisions we made for this product was whether it was better to “minimize the misery” or “maximize the joy”.

Democratic: Does music that both users like rise to the top?.Equal: Are both users in the Blend represented equally?.Coherent: Does the playlist have flow, or do the tracks feel completely random and unrelated to each other?.This is especially important for track attribution - if we put a user’s profile image next to a song, we need to make sure that this specific user would agree the song listed is representative of their taste.Relevant: Does the track we’re selecting for that user reflect their taste? Or is it just a song they accidentally listened to once?.When we are working with multiple users, however, we have the challenge of taking more attributes into account. For Daily Mix, our attributes are familiarity and coherency. For example, with Discover Weekly, our main attribute is discovery.

Most playlists are composed of a number of attributes and characteristics.

We dealt with unique challenges both in the content creation process, and in the invitation flow, to create a Blend. A major complication we saw here was the increase of scale in the number of users we had to deal with. With Blend in particular, we were taking concepts from Family Mix and Duo Mix, and expanding them to a much larger user group. This means we can’t always lean on our past experiences, and often encounter new challenges that require new solutions. The products were well received, so we decided to expand this product line, creating a version of opt-in, automatic, shared, personalized playlists that could work for any two users.Īnytime we want to make a new playlist at Spotify, we’re aiming to do something different that we haven’t been able to accomplish before. These products create shared playlists for users on the same Family or Duo plan. Prior to Blend, the team worked on similar products, Family Mix and Duo Mix. We recently launched a new playlist initiative, Blend, where any user can invite any user to generate a playlist wherein the two users’ tastes are combined into one shared playlist. What does it take to go from an idea for a new playlist, to shipping that playlist to Spotify users all around the world? From inception, to prototyping, to QAing, and finally shipping, releasing a new playlist at Spotify is a long process full of new learnings every time.

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