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The KeyMusician Keyboard transforms an ordinary computer with only a typing-keyboard, into a performance-quality musical instrument. And it's much easier to learn than most other music instruments, due to the musical intelligence built into the application.

Screen-Shot of the Application
(Chords-Pane, Playing a D-flat Minor 7th Chord)
In this example, playing in a key-signature with 5 flats, a D-flat minor chord is played, along with the melody-note C in the upper (treble) clef. Since the chord played requires a flat for the C, it is automatically added for the melody note.
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It doesn't matter how many flats or sharps are in the key-signature.  The fingerings you use to play it, are always the same, in either the chords, or the melody. The application takes care of this for you.