MuseScore is a free cross platform WYSIWYG music notation program, licenced under GNU GPL. Features: * WYSIWYG, notes are entered on a "virtual note sheet" * unlimited number of staves * up to four voices/staff * easy and fast note entry with mouse, keyboard or midi * integrated sequencer and FluidSynth software synthesizer * import and export of MusicXml and standard midifiles (SMF) * platform independent code for Linux, Windows and Mac jack-audio-connection-kit and portaudio are optional dependencies.