Unusual Guitar

A - B♭ - B - C - C♯ - D - E♭ - E - F - F♯ - G - A♭ - A
E - F - F♯ - G - A♭ - A - B♭ - B - C - C♯ - D - E♭ - E
A guitar using this tuning can tune to itself using the fact, with a single exception, that the 5th fret on one string is the same note as the next open string; that is, a 5th-fret note on the sixth string is the same note as the open fifth string. The exception is the interval between the second and third strings, in which the 4th-fret note on the third string is equivalent to the open second string.