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    Very nice. I worked on a similar project a few years back. This is actually very similar to the MusicBox project by Anita Lillie back in 2008 (see demo at: http://thesis.flyingpudding.com/videos/demo/index.html, thesis at http://thesis.flyingpudding.com/), which itself was build on top of the analysis provided by Echonest.

    Using the open-source aubio for the analysis and building playlist instead of working out a new player are very good decisions. When we tried to do something similar, this was also the direction we picked, and then had layers for sending playlists to various players.

    Now what’s missing here is an UI to “build” the playlist visually (check the demo in the link earlier). The principle for building such an UI is very simple: instead of just 1 distance between 2 songs, you have a set of N distances (corresponding to similarity to various parameters such as rhythm, loudness, pitch, but also tag metadata, etc) which is then reduced to 2 dimensions (using PCA), and you get a 2D map of all your music library. Then you can draw a path for building your playlist.

    This is in my opinion the only sane answer to “the music classifying nightmare” (http://blog.pkh.me/p/15-the-music-classifying-nightmare.html – author here).

    For a more traditional approach to solving the music classifying problem, I’d recommend looking at https://beets.io/

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      Thanks a lot for the very interesting references - I’ll take a look at implementing the PCA for blissify, to check how it performs.

      I’ve actually checked the landscape of tools like this before starting the project, and saw that there were a lot of music similarity thesis, but very few tools actually usable “out of the box”. So, instead of trying to make something really innovative, I’ve tried to aggregate the existing results to build a (somewhat) usable / maintainable “real-world” tool.