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Be they in major key or minor key, such I–IV–V chord progressions are extended over twelve bars in popular music—especially in jazz, blues, and rock music. [36] [37] For example, a twelve-bar blues progression of chords in the key of E has three sets of four bars: E–E–E–E7 A–A–E–E B7–A–E–B7;
IV-V-I-vi chord progression in C major: 4: Major I–V–vi–IV: I–V–vi–IV chord progression in C: 4: Major I–IV– ♭ VII–IV: I–IV– ♭ VII–IV. 3: Mix. ii–V–I progression: ii–V–I: 3: Major ii–V–I with tritone substitution (♭ II7 instead of V7) ii– ♭ II –I: 3: Major ii-V-I with ♭ III + as dominant ...
By thinking of this blues progression in Roman numerals, a backup band or rhythm section could be instructed by a bandleader to play the chord progression in any key. For example, if the bandleader asked the band to play this chord progression in the key of B ♭ major, the chords would be B ♭-B ♭-B ♭-B ♭, E ♭-E ♭-B ♭-B ♭, F-E ...
The chord-scale system may be compared with other common methods of improvisation, first, the older traditional chord tone/chord arpeggio method, and where one scale on one root note is used throughout all chords in a progression (for example the blues scale on A for all chords of the blues progression: A 7 E 7 D 7).
This is a plagal cadence featuring a dominant seventh tonic (I or V/IV) chord. However, Baker cites a turnaround containing "How Dry I Am" as the "absolutely most commonly used blues turnaround". [5] Fischer describes the turnaround as the last two measures of the blues form, or I 7 and V 7, with variations including I 7 –IV 7 –I 7 –V 7. [6]
Dominant 7th chords are generally used throughout a blues progression. The addition of dominant 7th chords as well as the inclusion of other types of 7th chords (i.e. minor and diminished 7ths) are often used just before a change, and more changes can be added. A more complicated example might look like this, where "7" indicates a seventh chord:
A common type of three-chord song is the simple twelve-bar blues used in blues and rock and roll. Typically, the three chords used are the chords on the tonic, subdominant, and dominant (scale degrees I, IV and V): in the key of C, these would be the C, F and G chords. Sometimes the V 7 chord is used instead of V, for greater tension.
Some pop songs borrow its chord progression, bass line, or melodic structure, a phenomenon attributed to the memorability and simplicity of the work. The Canon also shares roots with other, more significant chord progressions that lay the foundations of modern pop music. Its perceived ubiquity is itself an object of cultural discussion.