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GNU Denemo is a modal, graphical music notation program. (http://denemo.sourceforge.net). It is a great adjunct to inputting music notation and many use Denemo as their only notation editor. Denemo is a quick clean editor without all the clutter and eye candy of other editors. It places emphasis on your computer's keyboard for inputting notation so you won't need to fiddle setting up a midi keyboard to enter notation quickly
Speed is in fact where Denemo excels, with a choice of multiple key binding files it is easy to make Denemo perform to your individual needs. By making notation entry touch type-able denemo also saves your hands from the mouse fatigue associated with common notation packages
Denemo is intended to be used in conjunction with GNU LilyPond (http://www.LilyPond.org), but is adaptable to other computer-music-related purposes as well. Denemo tries to output LilyPond code for stable releases, but not necessarily the current version. The principle is to stay close enough to permit the use of the LilyPond 'convert-ly' script.