In reference to voice leading
in four-part harmony (SATB
), close and open structures refers to the relative spacing and voicing consideration
s of the chords.
- Open Structure: A voicing is considered to be of an open structure when an interval of an octave or more occurs between the soprano and tenor voices.
- Close Structure: A chord is considered to be of a close structure when the interval between the soprano and tenor voices is less than an octave.
This is a generally accepted terminology
al theorists, and should be recognized as such when used in conversation