The Progression Explorer

Use one familiar loop as a reference, then change one musical variable at a time. The starting progression is I-V-vi-IV. Careful comparison will show whether chord order, bass, voicing, timing or melody caused the difference you heard.

1 reference loop
4 main variables
compare by ear

same family

Play the reference loopI - V - vi - IV

The progression

Follow the arrows once, then use the player below to hear the loop.

Start with a controlled comparison

A useful experiment needs a stable reference. Keep the key, tempo, register and rhythm fixed. Change only one item, then play the original again.

Write the chord result in concrete terms. "The final V pulls into the restart" is useful. "The new version feels better" does not tell you what changed.

Explore chord order

Use the same four chords in C major:

Order	Chords	What to follow
I-V-vi-IV	C-G-Am-F	V moves deceptively to vi
vi-IV-I-V	Am-F-C-G	minor chord begins; V ends the unit
IV-I-V-vi	F-C-G-Am	plagal opening; vi receives the final accent
V-vi-IV-I	G-Am-F-C	dominant tension begins; I closes

These are rotations of one cycle. The collection stays fixed while the first chord, final chord and metric emphasis change.

Explore one replacement

Begin with C-G-Am-F. Replace one chord and keep the other three:

Replace vi with I: C-G-C-F. The minor turn disappears and the tonic receives more weight.

Replace IV with ii: C-G-Am-Dm. The final chord changes from major IV to minor ii and can prepare a later G.

Replace V with bVII: C-B-flat-Am-F. B-flat introduces modal colour and removes the diatonic dominant chord.

Listen for the changed chord and for both transitions around it. A replacement affects how you enter and leave that position.

Explore harmonic rhythm

Harmonic rhythm is the timing of chord changes.

one chord per bar gives every harmony equal space
two chords in the final bar makes the ending accelerate
holding I for two bars strengthens the tonic
delaying V makes its eventual arrival more noticeable

Keep the chord order identical during this test. Rhythm can transform the phrase without adding any harmony.

Explore bass and voicing

Play C-G-Am-F in root position. Then keep the chord names and choose nearby inversions so the upper voices move less.

Next, design a bass line that connects chord tones by step. The progression symbols remain I-V-vi-IV, but the line and texture can become substantially smoother.

Use a listening record

After each comparison, write four short observations:

Question	Example answer
What changed?	IV became ii
What stayed fixed?	key, tempo and melody
Which note exposed it?	F became the minor third of Dm; A became the fifth
What happened to the ending?	it now prepares V more clearly

Specific notes and positions turn an impression into knowledge you can reuse.

Suggested routes

Need a clear tonal ending?
Compare The ii V I and The Plagal Landing.
Need a repeating pop loop?
Compare The Axis Progression, Axis Rotation and The Doo-Wop Progression.
Need modal colour?
Compare The Modal Folk Vamp, The Mixolydian Drop and The Phrygian Menace.

Keep going

Everything in chord progressions

Open chord progressions