Hi all,<br><br>I&#39;d like to introduce <a href="http://chordify.net/" target="_blank">Chordify</a> [1], an online music player that extracts chords from musical sources like Soundcloud, Youtube or your own files, and shows you which chord to play when. Here&#39;s an example song: <a href="http://chordify.net/chords/passenger-let-her-go-official-video-passengermusic" target="_blank">http://chordify.net/chords/passenger-let-her-go-official-video-passengermusic</a><br>


<br>The aim of Chordify is to make state-of-the-art music technology accessible to a broader audience. Behind the scenes, Chordify uses the HarmTrace Haskell package to compute chords from audio. I&#39;ve been working on this project with a couple of colleagues for a while now, and recently we have made the website public, free to use for everyone.<br>


<br>We do not use Haskell for any of the frontend/user interface, but the backend is entirely written in Haskell (and it uses pretty advanced features, such as GADTs and type families [3]). We&#39;re particularly interested in user feedback at this stage, so if you&#39;re interested in music and could use an automatic chord transcription service, please try Chordify!<br>


<br><br>Cheers,<br>Pedro<br><br>[1] <a href="http://chordify.net/" target="_blank">http://chordify.net/</a><br>[2] <a href="http://hackage.haskell.org/package/HarmTrace" target="_blank">http://hackage.haskell.org/package/HarmTrace</a><br>

[3] José Pedro Magalhães and W. Bas de Haas. Functional Modelling of Musical Harmony: an Experience Report. In Proceedings of the 16th ACM SIGPLAN International Conference on Functional Programming (ICFP&#39;11), pp. 156–162, ACM, 2011. <a href="http://dreixel.net/research/pdf/fmmh.pdf" target="_blank">http://dreixel.net/research/pdf/fmmh.pdf</a><br>


<br>