Added tone chord
chord made of a tertian triad and a miscellaneous fourth note
An added tone chord, or added note chord, is a non-tertian chord composed of a triad and one or more extra "added" notes. Any tone that is not a seventh is commonly categorized as an added tone. It can be outside the tertian sequence of ascending thirds from the root, such as the added sixth or fourth, or it can be in a chord that does not consist of a continuous stack of thirds, such as the added thirteenth (six thirds from the root, but the chord does not have the previous tertian notes – the seventh, ninth or eleventh). The concept of added tones is convenient in that all notes may be related to familiar chords.
Inversions of added tone chords where the added tone is the bass note are usually simply notated as slash chords instead of added tone chords. For example, instead of Cadd2/D, just C/D is used.
An added tone such as fourth voiced below the root may suggest polytonality. The practice of adding tones may have led to superimposing chords and tonalities, though added tone chords have most often been used as more intense substitutes for traditional chords.
Added tone chords
Added second or ninth chords
An added second chord (or add2 chord) or added ninth chord (or add9 chord) is a major or minor triad with the note a major second or major ninth, respectively, above the root. For example, the add2 chord built on C, notated as Cadd2, has pitches C–D–E–G:
Since this is the same pitch class, the difference is the voicing of the added note within the chord.
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