ARN-Music B4 3-4 Harmonization by Triads and Tetrads for the Bass (4 strings). 

The app innovatively displays the triads and tetrads for any musical scale. Perfect for studying and applying chords and harmonizations.

You can move the tonic freely across the fretboard.

Thanks to the dedicated Circle of fifths for each scale, you can easily create smooth chord progressions.

Choose from four fretboard positions (left- or right-handed).

Use FOCUS to zero in on specific fretboard sections.

Want to experiment? Try different tunings and instantly get the right scale degrees for over 10 tuning presets.