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OM# (om-sharp) is a visual programming environment for computer-assisted composition and music/audio data processing.

It is derived from OpenMusic and based on Common Lisp.

OM# programs are made by assembling and connecting icons representing Lisp functions and data structures, built-in control structures (e.g. loops), and other program constructs, interpreted as Common Lisp expressions. The visual language can be used for general-purpose programming and reuse any existing Common Lisp code. At a more specialized level, built-in tools and libraries make it a powerful environment for music composition. Various classes implementing musical structures are provided, associated with graphical editors including common music notation, MIDI, OSC, 2D/3D curves, and audio buffers.

Download for macOS, Windows, and Linux

OM# is a free software distributed under the GPLv3 license.

As a Common Lisp program, OM# can be considered just as an extension of Lisp including the specific built-in features of the application. The application is developed with the latest LispWorks compiler (7.1.2), which provides multi-platform support and graphical/GUI toolkits in Common Lisp. A limited "Personnal" edition of LispWorks 7 is now available: its limited heap size requires compiling sources in several successive runs, and it is not possible to create new OM# executables with it, however, it allows to load and run/use/edit the program from the sources.

Alternatively, the OM# executable also includes a Lisp interpreter which can load and evaluate modifications and extensiuons of the program sources.

Project pages:
https://cac-t-u-s.github.io/om-sharp/

Design and development 2013-2019: J. Bresson, IRCAM STMS lab / Music Representations team; contributions by D. Bouche, J. Garcia, A. Vinjar. This project uses code and features from the OpenMusic project (by C. Agon, G. Assayag, J. Bresson and others, IRCAM STMS lab).