[Haskell-cafe] Chordify, a new web startup using Haskell

C K Kashyap ckkashyap at gmail.com
Fri Jan 18 04:10:27 CET 2013

Very cool :)
I tried this one http://chordify.net/chords/jamelia-superstar-emimusic
Not sure if the places it showed E flat - was it really E flat minor?

What next - index all the songs using their "chordification" and then
search them using a "hum" as input :)


On Fri, Jan 18, 2013 at 4:37 AM, José Pedro Magalhães <jpm at cs.uu.nl> wrote:

> Hi all,
> I'd like to introduce Chordify <http://chordify.net/> [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's
> an example song:
> http://chordify.net/chords/passenger-let-her-go-official-video-passengermusic
> 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 [3]). 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!
> Cheers,
> Pedro
> [1] http://chordify.net/
> [2] http://hackage.haskell.org/package/HarmTrace
> [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'11), pp.
> 156–162, ACM, 2011. http://dreixel.net/research/pdf/fmmh.pdf
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