Positions of triads represent various degrees of stability, and are like positions of cones. Chordal seventh in bass: THIRD INVERSION.Chordal fifth in bass: SECOND INVERSION.Positions of triads and tetrads are determined by the bass only the placement of chord factors in the upper voices are irrelevant to defining position.
These names are the same for tetrads, with the CHORDAL SEVENTH being the extra note.Īny chord factor may occur in the bass voice, creating different POSITIONS for these sonorities. The basic tetrads:Įach part of a triad has a specific name: when stacked in 3rds, the ROOT is the bottom note, the CHORDAL THIRD is in the middle, and the CHORDAL FIFTH is the top. These are also known as SEVENTH CHORDS, named for the interval from the bottom pitch to the top one.Īll tertian tetrads have two names: one for the triad on the bottom (major, minor, diminished, or augmented) and a second for the type of 7th (M7, m7, or d7). It is possible to stack one more 3rd on top of a triad, creating a TERTIAN TETRAD (four notes stacked in 3rds). Begin by learning all the basic triads (natural notes) first. The fourth one, two M3's, outlining an A5, is called an AUGMENTED TRIAD (A).Ĭalculating triads is a matter of stacking pitches into 3rds and identifying the intervals.The third one, two m3's outlining a d5, is called a DIMINISHED TRIAD (d).The second one, a m3 on the bottom and a M3 on top, is called a MINOR TRIAD (m).The first one, a M3 on the bottom and a m3 on top, is called a MAJOR TRIAD (M).There are only four possible combinations with these two intervals: A triad is a collection of three different pitches, and tertian indicates that these pitches are stacked in intervals of 3rds (either major or minor). The basic sonority of the Common Practice Period is the TERTIAN TRIAD. SONORITY is a generic term for a collection of pitches that may be sounded simultaneously it can be interchangeable with words such as "chord" or "harmony". The essential sonority of the Common Practice Period is consonant and is a group of three notes arranged in thirds.ĭissonance can be used on occasion in the form of a group of four notes arranged in thirds (a tertian tetrad)Ĭhapter 1. Sonorities, and Time Organization in Western Art Music Sonorities SOUND PATTERNS A Structural Examination of Tonality, Vocabulary, Texture,
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