MidiSwing is a little application to Create music. It can read and edit midi files MidiSwing is a "midi sequencer" displaying the content of midi files as a piano roll which you can edit. You can edit any existing midi file, or compose your own music from scratch. MidiSwing has been written in Java and is supposed to run on any Java 2 platform (Linux, Windows, Mac...). MidiSwing has been specially developed with the Mac OS X user in mind.