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Although changing the octave of certain notes in a chord (within reason) does change the way the chord sounds, it does not change the essential characteristics or tendency of it. Accordingly, using the ninth, eleventh, or thirteenth in chord notation implies that the chord is an extended tertian chord rather than an added chord.
In many styles of popular and traditional music, chord progressions are expressed using the name and "quality" of the chords. For example, the previously mentioned chord progression, in the key of E ♭ major, would be written as E ♭ major–B ♭ major–C minor–A ♭ major in a fake book or lead sheet.
Although "Giant Steps" and "Countdown" are perhaps the most famous examples, both of these compositions use slight variants of the standard Coltrane changes (The first eight bars of "Giant Steps" uses a shortened version that does not return to the I chord, and in "Countdown" the progression begins on ii 7 each time.) The standard substitution ...
I–V–vi–IV chord progression in C: 4: Major I–IV ... Coltrane changes in C: I–V/ ...
The major sixth chord (also called, sixth or added sixth with the chord notation 6, e.g., C 6) is by far the most common type of sixth chord of the first group. It comprises a major triad with the added major sixth above the root, common in popular music. [3] For example, the chord C 6 contains the notes C–E–G–A.
This is called a slash chord. For example, a C-major chord in first inversion (i.e., with E in the bass) would be notated as "C/E". This notation works even when a note not present in a triad is the bass; for example, F/G [5] is a way of notating a particular approach to voicing an Fadd 9 chord (G–F–A–C).
Simpler chord charts for songs may contain only the chord changes, placed above the lyrics where they occur. Such charts depend on prior knowledge of the melody, and are used as reminders in performance or informal group singing. Some chord charts intended for rhythm section accompanists contain only the chord progression.
Chord quality alteration is when the quality of a chord is changed, and the new chord of similar root and construction, but with one pitch different, is substituted for the original chord, for example the minor sixth for the major seventh, or the major seventh for the minor. [10] vii o 7 as dominant substitute ♯ II o 7 as dominant substitute