[Haskell-cafe] Chordify, a new web startup using Haskell
José Pedro Magalhães
jpm at cs.uu.nl
Fri Jan 18 00:07:33 CET 2013
I'd like to introduce Chordify <http://chordify.net/> , 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's an
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'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.
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 ). We're particularly
interested in user feedback at this stage, so if you're interested in music
and could use an automatic chord transcription service, please try Chordify!
 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'11), pp.
156–162, ACM, 2011. http://dreixel.net/research/pdf/fmmh.pdf
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