By Charles Reina
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Harmonica Key is a music reference app for harmonica players. The app provides a simple interface for looking up common harmonica tunings, as well as overlay information about chords and scales.
Players can choose to display information for different key scales and chords as well as change the root key of the harmonica. In addition, reference sounds are played when a note is touched to help players get the correct tone for bends and overblow notes.