- Blues harmony differs from tonal and jazz harmony in a number of important ways, especially in the treatment of the .
- In a standard 12-bar blues, all chords are .
- The blues is a that can have many alterations without ceasing to qualify as “a blues.”
- Common variations on the 12-bar blues are the , the , and the .
- The jazz blues blends jazz and blues harmonic languages together.
The blues is an extraordinarily important genre in U.S. popular music. Not only is the tradition itself very old, with roots reaching back to the music of enslaved African-Americans, but it continues to exert influence on 21st-century popular music.
The documentation on the history of the blues is quite limited due to its age, but the earliest blues songs existed in the late 1800s, and it seems to have grown out from earlier African-American musical styles, such as field hollers and work songs, as well as and rhythmic characteristics of West African music. In this sense, although jazz musicians very frequently play the blues, the blues as a tradition has distinct origins from jazz. Jazz developed first in New Orleans through a mix of African, Caribbean, and European influences. The result of this distinction is that many of the truisms of jazz or tonal music do not hold true in the blues. Among the biggest harmonic differences are that
- can have any (tonic, dominant, or subdominant)
- provide structural closure, instead of
- major and minor thirds are freely mixed together, and even used simultaneously (sometimes written in as a major/dominant chord with a ♯9 extension)
This chapter introduces some of the most common forms of the blues encountered in the 20th and 21st centuries.
The blues is a : a frame of reference for understanding lots of different chord progressions. Blues progressions can all be understood as outgrowths from a basic prototype.
The is composed of three (typically) four-bar phrases. A major difference between the blues and more traditionally tonal music is that it emphasizes instead of . At its most basic, the harmony progresses as shown in:
- The first phrase is entirely tonic harmony (I).
- The second phrase contains two bars of subdominant (IV) and two bars of tonic (I).
- The final phrase begins with one bar of dominant (V) followed by one bar of subdominant (IV) and two bars of tonic (I).
- All chords are dominant-seventh chords and do not fit into a single key.
This is the simplest version of the 12-bar blues, but innumerable variations exist upon these changes. One of the most common additions is that the second bar may move to IV, then return to I in the third bar. Another especially common trick is to employ some type of in the final bar or two of the progression, from something as simple as a V7 chord to a full III–VI–II–V progression. It can be difficult to find a blues tune that doesn’t make some alteration from the basic form shown in “You Can’t do That” by The Beatles (1964) is nearly the same, but it does add a V chord in the final bar as a turnaround..
Closely related is the , which is composed of four 4-bar phrases, usually two iterations of tonic, followed by subdominant and dominant (“Hoochie Coochie Man” by Muddy Waters (1954) is one example of a 16-bar blues. Notice that the final phrase may or may not end with a . The 16-bar blues is not as common as the 12-bar blues, but has somewhat heightened frequency in blues-based rock music.).
Most commonly, the blues is in “major” (which, in this context, simply means that the tonic harmony has a major 3rd above it—many pitches in a major blues fall outside the major scale). But another common variation on the blues is a . In a minor blues, the i and iv chords are minor sevenths instead of dominant sevenths; the V stays dominant. Because the motion from the major V to the minor iv can sound anticlimactic, the minor blues also typically replaces the V–IV–I motion in the third phrase with a ii–V–I ().
As mentioned in the introduction to this chapter, the blues treats harmony differently from jazz, and one of the large differences is the reliance upon rather than cadences. The is a variant of the 12-bar blues that mitigates this somewhat by adding several ii–V progressions to the blues.
Like the 12-bar blues, the jazz blues is composed of three 4-bar phrases. A basic version of the jazz blues is presented in.
Notice that the jazz blues mixes typical blues harmony (i.e., the use of non-V dominant-seventh chords and plagal resolutions) with jazz harmonic schemas: specifically, it uses ii–Vs and . In the eighth bar, instead of remaining on tonic, there is an applied ii–V that leads to the ii chord in bar 9. And in the third phrase, the V–IV–I of the standard blues is replaced with a ii–V–I more common to jazz.
One recording that performs the blues this way is the Lincoln Center Jazz Orchestra performing Duke Ellington’s “C Jam Blues.” This is easiest to hear during the solo sections, however not every repetition of this blues contains every chord shown in .
The blues can be varied extensively, yet still qualify as the blues. The chapter’s Spotify playlist goes through several tracks that have some slight variations on the schemas outlined above.
- “Runaway Blues” by Ma Rainey (1928) uses a IV in the first tonic phrase, and also embellishes the final V with an applied V/V.
- “Empty Bed Blues, Pt. 1” by Bessie Smith (1928) follows a basic 12-bar blues, but precedes most new harmonies with a tonicizing ii–V progression.
- “Surfin’ USA” by the Beach Boys (1963) presents a 16-bar blues, but he two first phrases each begin with two bars of V before two bars of I.
- “The Thrill is Gone” as recorded by B.B. King (1970) is in minor, and replaces the ii–V of the final phrase with ♭VI–V.
Musicians who have developed a familiarity with the blues will have no trouble recognizing the blues in a tune even with these, and more, variations.
- Worksheet on 12-bar blues (.pdf, .mscz). Asks students to write basic and jazz 12-bar blues progressions, voiced and unvoiced, and to analyze altered blues progressions. Worksheet playlist
A seventh chord in which the triad quality is major and the seventh quality is minor. For example: C–E–G–B♭
A schema is a mental representation of a stock pattern. In music theory, the term "schema" usually refers to a prototypical chord progression or formal structure. Significantly, schemas can appear with variations while still being recognized as an instantiation of that schema. We understand an individual pattern in the music (exemplar) as a version of an ideal general pattern (prototype), and that relationship helps us understand how that pattern is functioning within a particular passage of music. Schemas are often give names, like "Meyer" or "double plagal."
Schemas can have both internal defining characteristics and normative placements within a series of musical events.
• Internal characteristics may describe a schema’s melodic features, harmonic features, and metric features.
• A schema’s normative placement describes it temporal location. For example, we will normally find a closing schema like the “Prinner” at a close of a phrase.
A variation on the 12-bar blues progression. Composed of four (typically) four-bar phrases, usually two iterations of tonic, followed by subdominant and dominant. The final phrase may or may not end with a turnaround.
The minor blues differs from the standard 12-bar blues by having minor seventh chords on the i and iv chords, and replacing the V–IV–I cadence with a ii–V–I cadence.
The jazz blues incorporates several alterations to the 12-bar blues to blend together blues harmony and jazz harmony. In the eighth bar, instead of remaining on tonic, there is an applied ii–V that leads to the ii chord in bar 9. And in the third phrase, the V–IV–I of the standard blues is replaced with a ii–V–I more common to jazz.
A microtone is a tone that exists outside of the 12-tone equal tempered scale (for example, quarter tones).
The role that a musical element plays in the creation of a larger musical unit.
A plagal cadence uses the harmonies IV–I.
A cadence with the harmonies V–I. The harmonies are typically in root position. Authentic cadences can be further distinguished by their melody note in the I chord: an authentic cadence ending on scale-degree 1 in the melody is a perfect authentic cadence, while one with 3 or 5 in the melody is an imperfect authentic cadence.
A type of jazz/pop score that typically notates only the melody and the chord symbols (written above the staff).
Comprised of three (typically) four-bar phrases. The first phrase is entirely tonic harmony (I). The second phrase contains two bars of subdominant (IV) and two bars of tonic (I). The final phrase begins with one bar of dominant (V) followed by one bar of subdominant (IV) and two bars of tonic (I). The third phrase may or may not end with a turnaround.
Broadly speaking, a turnaround is the use of a non-tonic chord (usually dominant) at the end of a harmonically closed unit to transition into the beginning of the following on-tonic unit. In jazz, the term "turnaround" often refers to the progression vi–ii–V–I. The exact qualities of these chords is highly variable, and one or more of the chords may be substituted with a different, related chord.
In church modes, plagal modes run from the fifth note of the mode to the fifth an octave above.
In church modes, authentic modes are those which range from final to final.