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I've got 10 million songs in my pocket. Now what?

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The proverbial 'celestial jukebox' has become a reality. With today's online music services a music fan is never more than a few clicks away from being able to listen to nearly any song that has ever been recorded. Recommender systems can play a key role in this new music ecosystem, helping listeners explore, discover, organize and share music. However, in many ways music recommendation is very different than recommendation in other well-studied domains such as books and movies. In this talk we explore how recommender systems can be used in the music space, and the particular challenges that the music domain presents to the designers of recommender systems.

I've got 10 million songs in my pocket. Now what?

  1. I have 10 million songs in my pocket. Now what?Paul LamereACM Recommender Systems 2012 Photo (CC) by Jason Rogers
  2. The challenge of music recommendationA recommendation that no human would make If you like Britney Spears ... You might like the Report on Pre-War Intelligence
  3. The challenge of music recommendationWTF - Why the Freakomendations? Why do we see such bad music recommendations? Music is Special* *of course every domain is special
  4. The challenge of music recommendationWhy do we see such bad music recommendations? Understanding the domain is critical to the success of a recommender
  5. The challenge of music recommendationWhy do we see such bad music recommendations? 10 things to consider when building a music recommender
  6. #1 - Very large item space10 things to consider when building a music recommender
  7. #2 - Very low cost per item10 things to consider when building a music recommender
  8. #2 - Very low cost per item10 things to consider when building a music recommender
  9. #3 - Low consumption time10 things to consider when building a music recommender The average song length is around 4 minutes E Book Reader: 24 books a year Music subscriber: 25 songs a dayPew Internet Project.
  10. #4 - Highly Interactive10 things to consider when building a music recommender A typical music recommender ... ... in 1999, but not anymore
  11. #4 - Highly Interactive10 things to consider when building a music recommender Today’s recommender Recommendations are integrated into the listening experience
  12. #4 - Highly Interactive10 things to consider when building a music recommender Today’s recommender Minimal explicit feedback
  13. #4 - Highly Interactive10 things to consider when building a music recommender Today’s recommender Much Implicit Feedback - Playing - Skipping - Repeating - Adjusting the volume - Sharing with friends - Adding to a playlist - Repeating the song - Inspecting song info
  14. #5 - Very high per-item reuse10 things to consider when building a music recommender songs[“as time goes by”].playcount += 1
  15. #6 - Large personal collections10 things to consider when building a music recommender
  16. Personal Music Discovery ChallengeThere’s a long tail in my iPod Listener Study Listeners 5,000 Average Songs 3,500 Per User Percent of songs 65% never listened to
  17. #7 - Consumed in sequences10 things to consider when building a music recommender A good playlist is a balance of: • Coherence • Familiarity • Discovery • Variety • Surprise ... in a pleasing order
  18. #8 - Highly contextual usage10 things to consider when building a music recommender
  19. #9 - Highly passionate users10 things to consider when building a music recommender
  20. Let’s pause for a quiz Why is this formula troublesome for music recommendation and discovery?(ΔMī¹=αΣDi[n][ΣFij[n-1]+Fexti[[n̄¹]])
  21. Let’s pause for a quiz Why is this formula troublesome for music recommendation and discovery? Because it is the name of a song by Aphex Twin(ΔMī¹=αΣDi[n][ΣFij[n-1]+Fexti[[n̄¹]])
  22. #10 - OMG Metadata10 things to consider when building a music recommender The The Duran Duran Duran !!! ††† ///▲▲▲ ▼□■□■□■ Various Artists
  23. #10 - OMG Metadata10 things to consider when building a music recommender
  24. Music Taste is IrrationalThe challenge Music Music I Like You Like Music I Used To Like Get this t-shirt at dieselsweeties.com
  25. I have 10 million songs in my pocket. Now what?Paul Lamere Paul@echonest.com MusicMachinery.com @plamere Photo (CC) by Jason Rogers

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