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

I have 10 million songs in my pocket. Now what?Paul LamereACM Recommender Systems 2012 Photo (CC) by Jason Rogers

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

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

The challenge of music recommendationWhy do we see such bad music recommendations? Understanding the domain is critical to the success of a recommender

The challenge of music recommendationWhy do we see such bad music recommendations? 10 things to consider when building a music recommender

#1 - Very large item space10 things to consider when building a music recommender

#2 - Very low cost per item10 things to consider when building a music recommender

#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.

#4 - Highly Interactive10 things to consider when building a music recommender A typical music recommender ... ... in 1999, but not anymore

#4 - Highly Interactive10 things to consider when building a music recommender Today’s recommender Recommendations are integrated into the listening experience

#4 - Highly Interactive10 things to consider when building a music recommender Today’s recommender Minimal explicit feedback

#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

#5 - Very high per-item reuse10 things to consider when building a music recommender songs[“as time goes by”].playcount += 1

#6 - Large personal collections10 things to consider when building a music recommender

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

#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

#8 - Highly contextual usage10 things to consider when building a music recommender

#9 - Highly passionate users10 things to consider when building a music recommender

Let’s pause for a quiz Why is this formula troublesome for music recommendation and discovery?(ΔMī¹=αΣDi[n][ΣFij[n-1]+Fexti[[n̄¹]])

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]])

#10 - OMG Metadata10 things to consider when building a music recommender The The Duran Duran Duran !!! ††† ///▲▲▲ ▼□■□■□■ Various Artists

#10 - OMG Metadata10 things to consider when building a music recommender

Music Taste is IrrationalThe challenge Music Music I Like You Like Music I Used To Like Get this t-shirt at dieselsweeties.com

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

by Paul Lamere on Sep 13, 2012

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