MIDI
rosegarden - An integrated MIDI sequencer and musical notation editor. lilypond - A program for printing sheet music. timidity - Software-only MIDI sequencer. brahms - Graphical music editor and MIDI sequencer kmid - midi/karaoke player for KDE kmidi - midi-to-wav player/converter for KDE playmidi - MIDI player noteedit - KDE Music Note Editor pmidi - a command line midi player for ALSA sted2 - a fast, functional MIDI sequencer abc2mtex - An easy way of transcribing folk and traditional music
http://www.hitsquad.com/smm/linux/NOTATION/