Tracking play coverage in the Infinite Jukebox

Yesterday, I upgraded the Infinite Jukebox to make it less likely that it would get stuck in a section of the song. As part of this work, I needed an easy way to see the play coverage in the song. To do so, I updated the Infinite Jukebox visualization so that it directly shows play coverage. With this update, the height of any beat in the visualization is proportional to how often that beat has been played relative to the other beats in the song. Beats that have been played more have taller bars in the visualization.

This makes it easy to see if we’ve improved play coverage. For example, here’s the visualization of Radiohead’s Karma Police with the old play algorithm after about an hour of play:

As you can see, there’s quite a bit of bunching up of plays in the third quarter of the song (from about 7 o’clock to 10 o’clock). Now compare that to the visualization of the new algorithm:


With the new algorithm, there’s much less bunching of play. Play is much more evenly distributed across the whole song.

Here’s another example.  The song First of the Year (Equinox) by Skrillex played for about seven hours with the old algorithm:


As you can see, it has quite uneven coverage. Note the intro and outro of the song are almost always the least played of any song, since those parts of the song typically have very little similarity with the rest of the song.

Here’s the same song with the new algorithm:


Again, play coverage is much more even across all of the song outside of the intro and the outro.

I like this play coverage visualization so much that I’ve now made it part of the standard Infinite Jukebox. Now as you play a song in the Jukebox, you’ll get to see the song coverage map as well. Give it a try and let me know what you think.

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  1. #1 by christophergalpin on November 30, 2014 - 6:57 pm

    I love this app, it’s even better with your modification. Say is the upload broken at the moment? I keep receiving “Trouble analyzing that track internal error”, I even tried it in Incognito in case it was a caching/cookie/etc. artifact.

    • #2 by Paul on December 7, 2014 - 10:41 am

      thanks – upload was offline for a bit

  2. #3 by André Goulart on January 13, 2015 - 12:46 pm

    First of all, congratulations for the awesome app!
    I’m lovin’ it!

    I want to suggest some simple improve, I hope you read it!
    On high Threshold (Lower quality) sometimes there is a rough change in the song.
    Theoretically we have 2 equivalent beats in a transition.
    What about smoothing it by making it FADE?
    (I mean, quickly fade-out the original beat while fade-in the next one)
    I guess it would improve a lot the quality, it might be easy to implement and doesn’t require much processing.

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