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CHORDiUM is an open-source project that endeavours to transform a standard computer keyboard into a fully-functional music-making instrument utilising the Scoreless Music Method and design elements from CHORDiCA.

Watch a simple video demo in High Definition here:


What's New

  • [performance tweak] Switched harmonies for Key C to the new notes selection branching tree
  • [new feature] Global volume control slider for music volume
  • [new feature] Software settings slide out from behind LCD (press and hold TAB)


Mac OS X 10.5 or later

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CHORDiUM User Discussion

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Neploleppard Member IconReview+23

Horrible application. The notes are randomly strewn about on the keyboard such that it's nearly impossible to work out a single musical melody or anything of the like. This is more of a child's toy turns screensaver that holds little to no practical use.

It's a shame, too, I was excited to try it out.


Reply0 replies
Samuel222 Member IconComment+9

After installation I could not find anything, not a single explanation how to use it.
No manual, no help, nothing. I tried some chords, it sounds okay. Then I noticed
it eats a LOOOOOT of CPU, my Mac started to suffocate, and I trashed the app. Pity, it looks
like it should be fun.

Reply2 replies

Thanks for the review! I'll keep working on optimizing the code to reduce the hit on the system. On my iMac, it records a utilization rate of 10% system resources.

I've updated the app with a few more Quick Help screens and a note tip on-screen to inform people of the hotkeys to them. I hope that helps in the meantime before I can put out a more detailed tutorial.


When you have a version that works with Lion (or perhaps iPad) please send a note to karlek@mac.com

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Current Version (0.x)


Downloads 2,055
Version Downloads 1,464
License Free
Date 14 Jul 2010
Platform OS X / Intel 32
Price Free