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A Live Programming language for music
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Music notation and transformation in Clojure

A simple experiment with live music editing in clojure.


lein deps

How to use

lein repl

You are now in the playground. You can play single notes like so: (play a4) (play c#4)

You can play a chord using the chord function: (play (chord c4 f4 g4))

To define your own notes (by either the name as a string or the frequency) you can do: (def tuning-A (note 440)) (play tuning-A) (def my-D4 (note "D4")) (play my-D4)

More interestingly, you can create patterns of notes like so: (pattern [a4 c4 f4 g4]) In this case every given note in the vector represents one beat, this can be much more complicated, however, by using sub vectors to subdivide beats: (def background (pattern [a4 [c4 f4 g4 c4] [f4 [c4 g4 g4 g4]] c4])) (play background)

Patterns can also have chords: (def phrase (pattern [ [a4 [c5 c5]] [(chord a4 g4) [g4 (chord g4 a4) (chord e4 g4) a4]] [[a4 e4] e5]]))))
And all patterns can be looped: (play (looping 4 phrase))

Patterns are just vectors of notes adjusted to follow after eachother, so you can perform operations on them: (play (adjust-wait (reverse (pattern [a4 b4 c4])) 0))

Patterns can also be combined, meaning that the notes will play sequentially after one another: (combine (pattern [a4 b4]) (pattern [c4 d4]))


  • Playing samples
  • Instead of relying on minim's timing mechanism create my own metronome and handle playing the notes myself. This enables syncing patterns together and creating manipulable tracks.


Implementation by Chris Granger. Adapted from the idea by Jon Vlachoyiannis (

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