Call
Among alternative guitar-tunings, regular tunings have equal musical intervals between the paired notes of their successive open strings.
Guitar tunings assign pitches to the open strings of guitars. Tunings can be described by the particular pitches that are denoted by notes in Western music. By convention, the notes are ordered from lowest to highest. The standard tuning defines the string pitches as E, A, D, G, B, and E. Between the open-strings of the standard tuning are three perfect-fourths , then the major third G–B, and the fourth perfect-fourth B–E.
In contrast, regular tunings have constant intervals between their successive open-strings:
For the regular tunings, chords may be moved diagonally around the fretboard, as well as vertically for the repetitive regular tunings. Regular tunings thus often appeal to new guitarists and also to jazz-guitarists, as they facilitate key transpositions without requiring a completely new set of fingerings for the new key. On the other hand, some conventional major/minor system chords are easier to play in standard tuning than in regular tuning. Left-handed guitarists may use the chord charts from one class of regular tunings for its left-handed tuning; for example, the chord charts for all-fifths tuning may be used for guitars strung with left-handed all-fourths tuning.