Basic blues formula. All chords are dominant seventh chords. Creates the characteristic blues flavor and closes the 12-bar blues.
The I7-IV7-I7-V7 cadence with 4 chords creates an extended harmonic motion. The character depends on context and surrounding harmony.
In the I7-IV7-I7-V7 cadence each chord serves a role: I7 — Tonic (dominant), IV7 — Subdominant, I7 — Tonic, V7 — Dominant. The constant tension of dominant seventh chords creates a "suspension" — no chord gives full rest. V7 at the end "winds up" the next cycle. It's a closed harmonic system without true resolution.
Tension builds through the stepwise motion. The nature of resolution is defined by the final chord of the cadence.
The I7-IV7-I7-V7 cadence is typical of mixed. 12-bar blues (last 4 bars), rock and roll, boogie, jazz blues standards.
Common modifications: replacing one chord with an inversion, adding passing chords, rhythmic variation. Extending the cadence is achieved by adding preceding or following chords.
The I7-IV7-I7-V7 cadence is used for creating a particular harmonic color. 12-bar blues (last 4 bars), rock and roll, boogie, jazz blues standards. In form, it can appear at the end of a verse, chorus, or section. When analyzing harmony, notice how the cadence affects the perception of form — it can emphasize structural boundaries or blur them.
On guitar, the I7-IV7-I7-V7 cadence can be played in open position (keys of C, G, D, A, E) or with barre chords (any key). Pay attention to voice leading — try to keep common tones in place while other voices move smoothly. This creates a more connected and professional sound. Also try playing the cadence on higher frets using partial barres and jazz voicings.